Bestechman Turtle BM20K 14C28N Blade Titanium Handle Button Lock Folding Knife

The Bestechman Turtle BM20K is a compact button-lock folding knife designed for everyday carry and outdoor tasks. Its 20 mm bead-blasted blade is made from 14C28N stainless steel, valued for corrosion resistance and straightforward sharpening. With a hardness of 58–61 HRC, the blade offers practical, low-maintenance performance, though abrasive cutting may call for more frequent edge touch-ups. A green titanium handle with a tortoise pattern adds distinctive character, while the button-lock mechanism provides a convenient way to secure the blade open. Measuring 53 mm overall and 33 mm closed, this lightweight knife weighs just 24.5 g. The blade is 2.5 mm thick. Made in China, the Turtle BM20K pairs a striking finish with compact proportions for carry-ready utility.

14C28N Blade Introduction

14C28N is a high-value budget-to-midrange stainless steel that excels in corrosion resistance and ease of sharpening, making it a low-maintenance workhorse for EDC and wet environments, but it falls short of premium steels in edge retention and requires more frequent touch-ups when cutting highly abrasive materials like cardboard.

SPECIFICATIONS

• Blade Length: 0.79"(20mm)
• Closed length: 1.30"(33mm)
• Overall Length: 2.09"(53mm)
• Blade Thickness: 0.10"(2.5mm)
• Blade Material: 14C28N
• Blade Finish: Bead Blast
• Blade Hardness: 58-61 HRC
• Handle Material: Green Titanium, with Tortoise Pattern
  
• Locking Mechanism: Button Lock
  
• Weight: 0.86 oz (24.5 g)
• Made in China

Bestechman Turtle BM20K - Coin-Shaped Green Titanium Keychain Knife

The Bestechman Turtle BM20K folds into a green titanium coin just 1.30 inches across: a 20 mm 14C28N Wharncliffe blade, a button lock and a thumb-hole opener at 24.5 g (0.86 oz). More compact EDC gear at EDCMALL.

A Real Knife the Size of a Coin

Most keychain knives are afterthoughts - slip-joint blades you tolerate. The Turtle is a proper folder: 14C28N at 58-61 HRC, flat ground, bead blasted, riding in a machined titanium shell with a hex tortoise texture. Closed it is a 33 mm circle; press the button, press the thumb hole, and a 20 mm Wharncliffe swings out for mail, tags, cord and thread. 14C28N is the right steel here - it shrugs off the keyring's moisture and resharpens in under a minute. Compare it with D2, 154CM and CPM-MagnaCut in the table below.

Why the Bestechman Turtle Belongs on Your Keyring

• Folds into a 1.30 inch coin - no clip, no corners, nothing to snag.
• 20 mm 14C28N Wharncliffe blade at 58-61 HRC, bead blast finish.
• Machined titanium shell with hex tortoise texture for grip.
• Button lock: one-handed, ambidextrous and fidget-friendly.
• Blade thumb-hole opener works even with the knife still on the keyring.
• Just 24.5 g (0.86 oz) - lighter than a house key.
• Lanyard hole and included cord make the keyring the carry system.
• Anodized colour options (bead blast, purple, gold, green) are oxide layers, not paint.

Best Uses for the Turtle BM20K

• Keychain EDC: always present for mail, envelopes, tags and stray cord.
• Office and mailroom duty where a full-size knife would clear the room.
• Fifth-pocket or watch-pocket backup alongside a larger folder.
• Travel-kit utility blade for checked-bag tool rolls.
• Gift and stocking-stuffer carry for anyone who likes clever mechanical things.

Frequently Asked Questions

How small is the Turtle, really?
Closed it is a 1.30" (33 mm) circle weighing 24.5 g (0.86 oz) - about the footprint of a large coin. The 20 mm blade is genuinely usable for small cuts, not a novelty.

Is a 20 mm blade legal where I live?
In most jurisdictions a sub-1-inch blade is the most permissive class of folder, but local rules vary - check your own regulations before carrying.

How does it open and close?
Press and hold the button lock, then swing the blade out by its thumb hole; release the button and the lock engages. To fold, hold the button again and close the blade.

What steel is the blade?
Sandvik 14C28N at 58-61 HRC, bead blasted. It is stainless, fine-grained and famously easy to sharpen - a few passes on a small ceramic rod restore the edge.

Is there a pocket clip?
No - the Turtle rides on the included lanyard cord on keys, a bag or a zipper pull. That is the design's whole point.

Sandvik 14C28N vs. Common Pocket Knife Steels

Steel	Typical HRC	Edge Retention	Corrosion Resistance	Toughness	Sharpening Ease
14C28N (this knife)	59-61	Good	Excellent	Good	Very Easy
Nitro-V	59-61	Good	Very Good	Better	Easy
154CM	58-61	Good	Good	Very Good	Moderate
CPM-S35VN	58-60	Very Good	Very Good	Better	Moderate
D2 Tool Steel	58-61	Very Good	Fair	Good	Moderate
8Cr13MoV	57-59	Fair	Good	Good	Very Easy

14C28N is Sandvik's nitrogen-refined martensitic stainless, and it is the right steel for a 20 mm blade: hard enough at 58-61 HRC to hold a working edge through mail, tape and cord, corrosion-proof enough to live on a keyring, and so easy to sharpen that a few passes on a small ceramic rod restore the apex. The short edge is also quick to maintain - a full sharpening session takes less than a minute. The trade is raw wear resistance against abrasive cardboard; plan on more frequent touch-ups than a super steel. HRC figures are typical mill ranges, not a guarantee for any single blade.

Glossary of Key Terms

Bestechman
Bestech's sub-brand for value-focused folders built to the same tolerances as the main line, often with distinctive handle materials.

Turtle
Bestechman's coin-shaped keychain knife: a 20 mm Wharncliffe blade of 14C28N that folds into a round titanium shell with a button lock, 24.5 g all in.

Coin Knife
A folder whose closed silhouette is a circle, so it rides on a keyring like a large coin - no clip, no corners, no snag.

Wharncliffe Blade
A mostly straight edge with the spine sloping gently to the tip, giving maximum controllable edge length for precise small cuts.

14C28N Steel
Sandvik's nitrogen-refined martensitic stainless at 58-61 HRC. Corrosion-proof, fine-grained and quick to sharpen on a pocket stone.

Hex Tortoise Pattern
The machined hexagonal texture on the titanium shell, echoing a tortoise shell. It adds grip and keeps fingerprints off the finish.

Button Lock
A spring-loaded button in the handle that locks the blade open; press and hold to fold. One-handed, ambidextrous and fidget-friendly.

Thumb-Hole Opening
The hole in the blade near the pivot. Press it with your thumb to swing the blade out - no flipper tab to snag on pocket seams.

Lanyard Hole
The opening at the shell edge for the included cord, which is the Turtle's carry system - keys, bag, or zipper pull.

Anodized Titanium
Titanium colour produced by heat or voltage, forming an oxide layer. Purple, gold and green finishes are oxide colour, not paint - solvents will dull them.

Bead Blast Finish
A matte, uniform surface created by blasting the steel with fine media. It hides micro-scratches and kills glare.

24.5 Grams
Lighter than a house key. The Turtle disappears on a keyring until the moment an envelope or tag needs a real edge.

Who Should Buy the Turtle BM20K

• Keyring carriers who want a real blade, not a discount-store novelty.
• Minimalists who dislike clips and pocket bulk.
• Collectors of coin and fidget-format folders.
• Gift buyers - the anodized colours and coin mechanism land well.
• Anyone building a layered EDC kit around a larger folder.

Who Should Skip It

• Anyone needing a working-length blade - 20 mm is for small cuts, period.
• Users who want clip carry; the Turtle has none by design.
• Hard-use tasks - the 2.5 mm micro blade is for slicing, never prying.
• Buyers who find fidget mechanisms annoying; the button lock begs to be clicked.

Care & Maintenance

• Wipe the 20 mm blade dry after use; 14C28N is stainless, but a keyring knife lives with keys that scratch and moisture that lurks.
• One small drop of oil at the pivot every couple of months, then cycle the blade a few times - the tiny pivot needs very little.
• Rinse off pocket fluff with warm water if the action turns gritty, dry fully, then re-oil; never store it damp against keys.
• Sharpen on a small ceramic rod or pocket stone; the short edge takes less than a minute to bring back to shape.
• Press the button lock fully before closing; the tiny blade has no tolerance for being forced past a live lock.
• The bead-blast titanium finish hides micro-scratches - wipe with a dry cloth; anodized colours (purple, gold, green) are oxide layers, so keep solvents off them.
• Inspect the lanyard cord occasionally and re-tie it if it frays; the Turtle has no clip, so the lanyard is the carry system.
• Check the body screws occasionally with the correct driver; vibration from keyring carry can back hardware out.
• Never pry with the 20 mm tip - at this size the blade is for slicing, tape and envelopes, not leverage.