HEAVY DUTY Combat Military Tactical Rescue Spring Assist DZS Knife - Tophatter's Inc. Weapons Store OnlineDay Zero Survival Knife Fast action spring assist knives give you a tactical advantage when every second counts. Quick, one handed opening with inner spring assist. Assisted Rescue Linerlock. 4 3 4" closed. 3 1 4" stainless steel assisted opening blade with dual thumb studs. Integrated seat belt cutter and glass breaker. Stainless pocket clip. Specifications: Heavy Duty! Weighs 8. 65 oz 8 1 4 Inches Overall when opened, 3 1 4 Inch overall blade length