BKL Single 30mm Double Strap Ring, 3/8" or 11mm Dovetail, 1.263" Long, Black BKL Single 30mm Double Strap ring Fits 3/8" or 11mm dovetail 1.263" clamp length 1.263" ring length 1.263" overall length 0.979" from bottom of mount to bottom of scope tube 3 hex screws secure the base 4 hex screws on the ring cap Black 3.30 oz. Includes 1 (one) ring and a hex wrench