BKL Single 30mm Double Strap Ring, 3/8" or 11mm Dovetail, 1" Long, Black BKL Single 30mm Double Strap ring Fits 3/8" or 11mm dovetail 1" clamp length 1" ring length 1" overall length 0.979" from bottom of mount to bottom of scope tube 2 hex screws secure the base 4 hex screws on the ring cap Black 2.80 oz. Includes 1 (one) ring and a hex wrench