Overview The IST Spearfisher&';s Knife is a streamlined, durable dive knife designed for spearfishing, freediving, and general underwater utility. Built around a classic spearfishing knife profile, it combines a substantial stainless steel blade with versatile cutting edges for handling line, rope, and other routine dive tasks. The 4mm-thick blade is constructed from 420J2 stainless steel for a balance of toughness and corrosion resistance in marine environments. Its double-edge configuration includes one smooth cutting edge and one serrated edge with an integrated barb, providing multiple cutting surfaces in a single compact tool. Best For Spearfishing Freediving Scuba diving Cutting line or rope underwater General-purpose underwater utility Key Features 4mm Stainless Steel Blade: Substantial blade construction provides strength and durability for underwater use. 420J2 Stainless Steel: Offers good toughness and corrosion resistance for repeated exposure to marine environments. Double-Edge Design: Combines a smooth cutting edge with a serrated edge for greater versatility. Integrated Barb: Serrated side incorporates a barb as part of the traditional spearfishing knife design. Streamlined Profile: Classic shape keeps the knife relatively compact and manageable as part of a dive setup. Sheath & Straps: Supplied as a complete carry setup with sheath and straps. Specifications Brand: IST Product Type: Spearfishing / Dive Knife Blade Material: 420J2 Stainless Steel Blade Thickness: 4 mm Blade Length: Approx. 13 cm / 5.1 in Overall Length: Approx. 25 cm / 9.8 in Blade Style: Double Edge - Smooth & Serrated Total Weight: Approx. 240 g / 0.53 lb with sheath and straps What&';s Included One IST Spearfisher&';s Knife Knife sheath Mounting straps FAQs What is the blade made from? The blade is constructed from 4mm-thick 420J2 stainless steel. Does the knife have a serrated edge? Yes. The double-edged blade includes one smooth edge and one serrated edge with a barb. How long is the blade? The blade measures approximately 13 cm / 5.1 inches, with an overall knife length of approximately 25 cm / 9.8 inches. Does it include a sheath and straps? Yes. The stated total weight of approximately 240 g / 0.53 lb includes the knife, sheath, and straps. Care & Maintenance Rinse the knife, sheath, and straps thoroughly with fresh water after every dive, particularly after saltwater use. Allow all components to dry completely before storage. Periodically inspect the blade for corrosion or damage and the sheath and straps for wear. Follow applicable local regulations regarding the transport and use of dive knives. Expert Insight The IST Spearfisher&';s Knife combines the utility of smooth and serrated cutting edges with a relatively thick 4mm stainless steel blade. Its compact 5.1-inch blade and included sheath-and-strap setup make it a practical addition for divers who want a traditional spearfishing-style cutting tool without unnecessary bulk.