Model 81 Survive Knife/Saw (clam) Field Knife With Saw, Black With sturdy saw at the back of the blade The no-nonsense GLOCK knife features a tough 6 1/2 inch carbon steel clip point blade and molded polymer hilt Tough enough to break windows or cut through the toughest tree limb, yet perfectly balanced for appropriate conditions. The one-piece polymer sheath is ideal for keeping the 3/16 inch blade protected.