BKL Single 30mm Double Strap Ring, 3/8" or 11mm Dovetail, 1.263" Long, Low, Black BKL Single 30mm Double Strap ring Fits 3/8" or 11mm dovetail Low profile 1.263" clamp length 1.263" ring length 1.263" overall length 1.271" from bottom of mount to the center of the scope tube 0.680" from bottom of mount to bottom of scope tube 3 hex screws secure the base 4 hex screws on the ring cap Black 2.90 oz. Includes 1 (one) ring and a hex wrench