- MICROSUB 304, the ultralight, compact back-up diving knife from MAC. An indispensable piece of equipment for every diving expedition. Dagger head made of AISI 304 steel with high corrosion resistance, coated with non-reflective IDROGLIDER GOLD® Black.

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.
MICROSUB 304, an ultralight, compact diver's knife (back-up) with a black matte coated blade. Manufactured by Italian company MAC Coltellerie. An essential piece of equipment during every diving expedition.
304 (18-8) is an austenitic steel containing at least 18% chromium and 8% nickel, combined with up to 0.08% carbon. It is a non-magnetic steel that cannot be hardened by heat treatment, to obtain greater tensile strength it must be cold worked. A minimum chromium content of 18% provides corrosion and oxidation resistance. The metallurgical characteristics of the alloy are mainly due to its nickel content (8% mm.), which also increases resistance to corrosion caused by the reduction of chemicals Low carbon content (0.08% max.), means less carbide precipitation in the heat affected zone during welding and less susceptibility to intergranular corrosion.
Blade - Dagger profile, 3.8mm thick. Made of polished stainless steel AISI 304 with high corrosion resistance, adapted to long-term contact with water. Hardened steel in the range of 55-56 HRC. Blade coated with scratch resistant non-reflective IDROGLIDER GOLD® Black coating.
Both sides of the blade have a Flat Grind for excellent cutting qualities. One blade is fully Plain, the other Serrated with a few millimeters of smoothness at the tip. Serrated blade used in diving, rescue and survival knives. Unique blade consists of one large and three small alternating teeth so called three-step. This pattern increases cutting edge length by up to 24% over a straight blade. Ideal for aggressive cutting of hard materials, plastics and fibrous materials such as rope and netting.
Handle - sand colored. Covered with non-slip textured ABS plastic facings. Steel rivet pin and ergonomic shape of the facings prevent slipping of the hand during work.
Sheath - made of hard PP polymer with holes for drainage of water, moisture. The holster is equipped with a latch that prevents the knife from slipping out in water. To the scabbard is attached two rubber straps and 2 plastic buckles that allow you to attach the case to the hand, leg or to the vest.
Technical data:
Product number: MC MICROSUB 304
Product name: MICROSUB 304
Type of steel: AISI 304
Blade hardness: 55-56 HRC
Blade length: 60.0 mm / 2.36"
Blade thickness: 3.8 mm / 0.149"
Total length: 145.0 mm / 5.70"
Weight: 55.0 g / 1.94 oz
Cutting edge type: Plain & Serrated
Blade type: Dagger (dagger)
Blade finish: IDROGLIDER GOLD® Black
Handle material: ABS
Sheath: PP (polyethylene)
Manufacturer: MAC Coltellerie, Italy
Development: Sharg® company