Ambidextrious thumb safety with extra-high shield ensures a safe "high thumb" position. Prevents even the slightest thumb-to-slide contact for more consistent cycling and less chance of jams. Large, oversized thumb contact area is comfortably curved to match the natural shape of the thumb; provides increased leverage for better recoil control. Mfg: American Shooting Center Inc. SPECS: Stainless steel, matte. Serrated contact pad .950" (24mm) long x .315" (8mm) wide. Single, left side (Single) or ambidextrous (Ambi) models. Fits 1911 Auto only, gunsmith fitting required.