Talley 30mm Screw Lock Detachable Ring Med Color Case Hardened Color Case. Crafted from hardened Chromoly steel for years of durability and performance. The radial mil spec scored screws cannot be overcome by a weak clamping spring. The forward mount of this ring will not allow the Rifle Scope to move forward or backward under recoil. The forward mount can only be installed if the primary scope is removed. A secondary clamping screw can be added if necessary for stability. With this high quality American made ring system you don't need to worry about damaging your Rifle Scope or having it come loose. Specifications for Talley 30mm Screw Lock Detachable Ring Med Color Case Hardened: Manufacturer: Talley Finish: Matte Ring Height: 0.4 in Tube Diameter: 30 mm Ring Quantity: Pair Fabric/Material: Chromoly Steel Weight: 4 oz Country of Origin: USA Package Contents: Talley 30mm Screw Lock Detachable Ring Med Color Case Hardened Talley CCH400004: 30mm Screw Lock Detachable Ring Med Color Case Hardened Color Case