Each Weaver base is machined to the tightest tolerances for a custom fit. They are designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver detachable ring. Specifications:- Package Includes 1 Base- Material: Aluminum- Style: Weaver- Finish: Matte BlackFits: – Browning Models A-Bolt A-Bolt 22 Stalker Medallion (Front & Rear) BBR LA/SA (Rear)- Cooey 71 (Rear)- Enfield (Cut down like a Winchester 70)(Rear)- Marlin MR7 (Rear)- Sears 53 (Rear)- Winchester Models 70 LA(hole spacing same) 300 Magnum & 70 SA 670 & 770(Rear)Note: Mounting Hardware Included.