Includes: Scope Ring Mount, Allen wrench Materials: 6061 Aircraft Grade Aluminum Scope Compatibility: 34mm Scope Tubes Red Dot Compatibility: RMR Footprint Weight: 2 oz Finish: Hard Anodized Black Warranty: Lifetime For piggyback mounting of red dot sights as a secondary sighting system directly to your rifle scope tube. Allows for fast transition between your rifle scope and a 1x power red dot optic for use at closer ranges. Compatible with RMR standard footprint