Cold Steel 58SQ Andrew Demko designed AD-15. The AD-15 might be the most comfortable, user friendly, sub 4 inch tactical folder Cold Steel has ever made! Modeled after Andrew Demkos patented original, it offers ambidextrous operation and opens and closes with one hand. The saber ground spear point blade comes with a false edge and includes jimping on the spine to assure great piercing ability and edge control when precision cutting is required. The AD-15s unique hybrid handle is what distinguishes it the most; because it features Andrews famous Scorpion Lock. You see, the bottom portion of the handle has 3D-machined G-10 scales mated to steel liners, while the upper portion of the handle, called the "yoke" is crafted from a 3D-machined 6061 aluminum billet that includes an integral back spacer which conceals a strong compression spring. To open the knife, simply engage the thumb stud and watch the yoke rise up, until it falls snugly into a deep notch cut in the blades tang. Held securely by constant pressure from the spring and, supported by the strength of ones grip, the Scorpion Lock is virtually immune from failure! SPECIFICATIONS: --WEIGHT: 6.5 oz. --THICKNESS: 3.8mm --BLADE LENGTH: 3 1/2" --HANDLE: 5" Long --STEEL / MATERIAL: S35VN Stainless --BLADE EDGE: Plain Edge --OVERALL: 8 1/2" --BRAND: Cold Steel --ITEM NUMBER: CS58SQ --ITEM NAME: AD-15 58SQ --UPC CODE: 705442018681 Country of Origin: Tiawan