- Marine B91/5 Yellow sailor's knife with shackle by the Italian company MAC Coltellerie, at a great price! Sits securely even in large hands, Yellow handle made of PP plastic. Blade steel W 1.4028, number of blades (2) functions (4).

This product is intended for use only by adults with knowledge and experience in handling sharp cutting tools. Improper use of the knife can result in serious injuries. The blade is extremely sharp and can easily cut through skin and tissue; therefore, extra caution should always be exercised while cutting, and hands should be kept away from the cutting edge. To prevent the knife from slipping, it is recommended to cut on a stable, non-slip surface and avoid excessive force, which may cause uncontrolled blade movement.
Leaving the knife on the edge of a table, countertop, or in easily accessible places—especially where children are present—poses a significant safety risk. The knife should always be properly secured after use, ideally by placing it on a stable surface or storing it in designated knife blocks, protective sheaths, or magnetic strips. The knife should never be used for tasks it is not designed for, such as opening cans or prying objects, as this can damage the tool and lead to dangerous accidents.
A dull blade increases the risk of injury, as it requires more force and is more likely to slip from the material being cut. Therefore, it is essential to sharpen the knife regularly to maintain optimal sharpness. Additionally, proper cleaning and drying of the knife are necessary to prevent corrosion and bacterial growth. Periodic inspection of the handle and blade is recommended to check for cracks, chips, or looseness. If any damage is detected, the knife should be repaired or replaced immediately.
When using the knife, focus solely on the task at hand—avoid talking on the phone, watching television, or other distractions while cutting. Ensure proper lighting in the workspace for better visibility and control. Please note that some countries or regions have laws restricting the ownership and carrying of knives. Before purchasing or using this knife, verify that its use is legal in your location according to applicable regulations.
Following these safety guidelines will help ensure safe and effective knife use, minimizing the risk of accidents and extending the lifespan of the tool.
Marine B91/5 Yellow, a folding sailor's knife with shackle from the Italian company MAC Coltellerie. It fits securely even in large hands. Number of tools (2) and functions (4).
1.4028 (3H13, X30CR13) - is a martensitic, chromium grade of a group of stainless steels designed for hardening and tempering. The steel is included in the list of related counterparts - 0H13, 1H13, 2H13 and 4H13 - a group of materials without Nickel, containing an average of 13% Chromium, which are distinguished mainly by their carbon content in the chemical composition, and thus higher strength properties. The differences have a significant impact on the possibility of obtaining particular hardness ranges and levels of corrosion resistance, where 3H13 / X30Cr13 is a balanced choice between 2H13 and 4H13.
Regular maintenance of 1.4028 stainless steel (3H13, X30CR13) prevents deposits and maintains its luster. It also makes it easier to remove spots and tarnish. Cleaning should be done before there is a visible layer of dirt or fingerprints, so the danger of permanent discoloration of the steel surface is minimized. For cleaning, do not use agents that contain: chlorine, salt, acids and bleach.
Blade - with a thickness of 2.5 mm. Serrated blade of Serrated type was derived with Full Flat grind. The saw blade consists of alternating one large and three small teeth, the so-called three-step. This pattern increases the length of the cutting edge by up to 24% compared to a straight blade. Traditional Slip Joint lock.
Blades - additional features:
- main blade, length 85 mm, Slip Joint lock.
- Shackler (sailor's wrench) for unscrewing / tightening shackles
- other: cap opener, marspikiel
Handle - in an easy to find bright yellow color. Covered with non-slip textured PP polymer facings. Ergonomic shape of the facings prevents the hand from slipping during work.
Technical data:
Product number: MC B915.Y
Product name: Marine B91/5 Yellow
Overall length: 185.0 mm / 7.28"
Blade length: 85.0 mm / 3.34"
Blade thickness: 2.5 mm / 0.10"
Handle length: n.d.
Handle thickness: n.d.
Weight: 100.0 g / 3.52 oz
Blade material: 1.4028 (3H13, X30CR13)
Blade hardness: 53-54HRC
Blade grind: Flat
Blade finish: Mirror
Handle material: PP (polyethylene)
Handle finish color: Yellow
Backspacer material: Stainless Steel
Backspacer color: Gray
Clip: None
Clip material: n.d.
Pivot mechanism: Washers (washers)
Locking mechanism: Slip Joint
Opening method: Manual, Nail Nick
Additional accessories: None
Designer: MAC Coltellerie
Brand: MAC Coltellerie
Manufacturer: MAC Coltellerie, Italy
Country of origin: Italy
Development: the Sharg® company