BKL 303 0.6 Long Dovetail Scope Ring - Low - Single is designed for the shooter who needs stability and prefers independent rings. Model 303 is for 30mm scope tubes and designed to fit all standard 3/8 guns and 11mm airgun dovetail rails. Technical Specifications of BKL-303 Dovetail Low Single Ring: - Fits 30mm scope tubes; - Overall Length: 0.60; - Clamp Length: 0.60; - Ring Width: 0.60; - Bottom of Mount to Bottom of Scope Tube: 0.680. - Weight: 1.8 oz; - This item sold as a single mount only. BKL's rings and risers are now available as individual items instead of just pairs. BKL Singles can be mixed and matched to suit your specific shooting application. BKL Mounts features: - Strong One-Piece Clamping Base allows easy mounting of 30mm scopes; - Patented Auto-Centering technology solves the problems created by varying mounting rail widths. - Clamping Legs move equally as the clamping screws are tightened keeping the scope centered on the rail. - BKL mounts are manufactured from aircraft-grade aluminum alloy on state of the art machinery in Texas. BKL Technologies is the manufacturer of the largest selection of gun and airgun scope mounts in the U.S. Competition-grade scope mounting system includes scope mounts, scope rings, dovetail to weaver adaptors, and scope risers that utilize a quick-installing and self-aligning clamping system that fits both 11mm and 3/8 dovetails. BKL mounts are compatible with popular gun and airgun manufacturers. Try BKL, and discover why many shooters use no other mount.