To achieve the ideal eye relief attach this Weaver Dual Extension Top Mounting Rings. Move your scope to the front or back for a custom fit that provides you with a comfortable line of sight. It offer wide top steel caps that hold zero under the most jarring recoil. These quick detach rings are the Original Weaver-style.Specifications and Features: Type: top mount Size: 1" Dual Extension Tube diameter: 1" Finish: black