Browning 1 Inch Rimfire Scope Rings are ultra rigid vertically split rings. Sleek elegant design with double recoil lug system. Will withstand the heaviest magnum recoil. Use oversize hardware for extra strength and ease of installation. These Rimfire Scope Rings are compatible with the two piece Scope Bases for A-Bolt, BAR, BLR and the X-Lock bases for X-Bolt rifles. Standard .300 inches for scopes with an objective up to 44mm and a standard barrel contour. Intermediate .400 inch for scopes with an objective up to 50mm and a standard barrel contour. High .500 for scopes with an objective up to 56mm and a standard barrel contour. Made of high quality aluminum. Requires Base number 12389. Signature look of the Browning Buckmark with hard applied gold treatment.