Replaces the grip on the right side of Colt-Style semi-auto frame so it can't interfere with thumb safety operation. "Quad Lock" installation system securely attaches the mount to the frame at four points. Accepts Weaver-style rings. No drilling or tapping. Mfg: Aimtech SPECS: Black-anodized, extruded aluminum. Approx. 5-1/2" long, 6" (15.2cm) high. Includes mounting pins and instructions. Cannot be used with ambidextrous safety or ambidextrous slide release.