With this Rail you can add Accessories to your Really Right Stuff 30mm Uniblock Scope Mount. Add lasers, flashlights and red dots to your scope without having to re-zero all over again. Customize your shooting setup, try it out today! Features: Machined out of solid 6061 T6 AluminumOffset Design doesn't get in the way of scopeDimensions: 1.37" x 0.83" x 0.63" Weight 0.6oz Really Right Stuff 30mm Picatinny Scope Ring Offset Accessory Rail SRA-30