Knuckle OTF Trench Knife D/A Automatic Carbon Fiber Dagger. This design with the button on the front panel is easier to operate for people who have a hard time with buttons being too hard. Just something about the way your hand grips this knife makes the difference. Your new knife is fitted with a pocket clip and you also get a deluxe sheath with each. Blade: 3.5" Overall: 9.5" Closed: 6" Weight: 14.6 oz.