RWS Lock Down 1-Pc Mount w/1" Rings, 11mm Dovetail, Barrel Droop Compensation 1" rings Fits 11mm dovetail 4.75" in length 2 hex screws per ring 4 hex screws secure base to scope rail 2 recoil stop pins .025" elevation compensates for barrel droop Made of aircraft-grade aluminum Includes hex wrench Black matte Does not fit the following scopes because the tubes on these scopes aren't long enough: PY-A-5164, PY-A-3864, PY-A-4722 and PY-A-5312.