The K.I.S.S. in the Dark blade shape is Tanto-inspiredChisel-Point grind on the front and flat on the backsideso that when the blade is closed onto its handle/frame, the precision fit effectively seals the cutting edge to the frame, even though it"s exposed.A thumb stud is used to one-hand open the blade, and as the blade is fully rotated open, the Frame Lock snaps crisply in behind the blade to give a sound lockup. The blade can be closed with one hand, simply by releasing the Frame Lock. K.I.S.S. stands for Keep It Super Simple. It"s one honey of a knife, precision fine blanked for superior fit and smooth operation. Ed Halligan"s unique two-piece construction features an integral Frame Lock, and a breakthrough design which seals the cutting edge against the handle. Blade and frame are 420J2 stainless steel. SPECIFICATIONS:- Weight: 2.3 oz.- Blade Length: 2.25""- Length Closed: 3.5""- Overall Length: 5.75""- Blade Style: Chisel Ground Tanto- Steel: 420J2- Blade Finish: Black corrosion resistant- Edge: Plain- Rockwell Hardness: 54-56- Handle: Black Corrosion Resistant Coated Integral 420J2- Fittings: Black Corrosion Resistant Coated Stainless Steel- Pocket Clip: R/H, Tip Down, Black corrosion resistant Stainless Steel- Opening: R/H Thumb Stud- Lock Type: Frame Lock