This is the Aqua Lung Big Squeeze Dive Knife Features: Patented locking mechanism securely locks knife in sheath, but releases easily with a squeeze of the handle (Patent # 5,926,959) Integrated BC connection points 10.8cm (4 1/2) blade, 24.2cm (9 1/2") overall length 304 stainless steel or high-grade Beta Alloy Titanium Nylon with fiberglass-fill handle and sheath for superior impact and abrasion resistance Integrated BC connection points Leg strap channels 5.1cm (2") locking clip Drain holes in sheath Lanyard holes Aqua Lung Squeeze Lock dive knives are preferred by divers around the world. The patented Squeeze Lock design allows the diver to securely lock the knife in its sheath while offering a quick and easy release with a simple squeeze of the handle. The Big Squeeze knife has a 10.8cm (4 1/2") blade, is 24.2cm (9 1/2") long overall and can be easily mounted to integrated connection points on most Aqua Lung BCs. "