Customized version of M390 powder steel Cold Steel AD-15 tactical folding knife (carbon fiber handle). The AD-15 may be the most comfortable and user-friendly Cold Steel tactical folding knife under 4 inches to date! Modeled after Andrew Demko's patented original of the same name, it offers nimble operation and great peace of mind. Powerful penetration and edge control when cutting. The AD-15’s unique hybrid handle is its best feature as it features Andrew’s famous Scorpion Lock. The scorpion lock is firmly held by the constant pressure of the spring and supported by the grip. The harder it is, the stronger it is! Full length: 217mm; Blade steel: Austrian M390 powder steel; Handle material and treatment: three-dimensional processed carbon fiber, blue titanium-plated T6061 aluminum alloy; cryogenic heat treatment, surface ultimate brushing treatment, blade hardness: 61HRC: blade thickness: 3.8 mm; Blade length: 89mm; handle length: 124mm Pocket clip: double smart stainless steel pocket/belt clip weight: 194g.