Leupold LRW 30mm Rings are made from Strike Forged Steel for maximum durability. They fit Weaver-style bases and lock your optic securely to the firearm for years of trouble-free use. CNC machining ensures tight tolerances and a perfect fit Anti-slip grooves in the rings eliminate the need for lapping Nylok ring screws won't back out under vibration or heavy recoil Leupold LRW 30mm Rings offer Leupold quality and durability with the convenience of Weaver-style rings. They're built to withstand lots of punishment and keep your rifle zeroed. Mfg: Leupold