BKL Single 30mm Triple Strap Ring, 3/8" or 11mm Dovetail, 1.53" Long, Black BKL Single 30mm Triple Strap ring Fits 3/8" or 11mm dovetail 1.53" clamp length 1.53" ring length 1.53" overall length 0.979" from bottom of mount to bottom of scope tube 4 hex screws secure the base 6 hex screws on the ring cap Black 3.90 oz. Includes 1 (one) ring and a hex wrench