PRI Aluminum 30mm Scope Rings are built with the strength to withstand hard recoil without adding unnecessary weight to your rifle. Precision Reflex machines them from 6061 T6 aluminum - not an exotic alloy but one that's proven itself as more than adequate for most scope mounting applications - and applies a durable, corrosion-inhibiting, hardcoat anodized finish. Ring caps on PRI Heht Aluminum 30mm Scope Rings are anchored by four robust Torx-head screws, while a hardened steel crossbolt secured by a substantial 1/2" diameter steel hex nut fixes the ring to the scope base. Sold in pairs Mounts to standard Picatinny scope base Fits 30mm scope tubes Mfg: Precision Reflex