LVLing Low Profile Weaver/Picatinny Tactical Rail Adaptor for .22/Airgun Rifles &uml;C 100mm Long, 9 Slots 3/8" 11mm WEAVER PICATINNY 7/8" 20mm RAIL MOUNT ADAPTER Base attaches to dovetail converted to weaver Material: High Quality Aluminum Picatinny/Weaver, 9 Slots Fits dovetail 11mm rail.