Material: Aluminum Alloy Size: length 26mm width 24mm height 7mm Function: 11mm to 20mm adapter Dovetail to Picatinny/Weaver Rail Adaptor Innovative Rail Platform to Convert Most .22/Airgun Rails Op Slot with Spring Tension Retraction/Expansion Design to Snap into Picatinny/Weaver Base Extremely Low Profile and Lightweight Precision and Repeatable Alignment Easy Installation, 2pcs/set Product size: 26x24x7mm Material: Aluminum Weight: 7.4g Rail Type: Picatinny / Weaver Includes right angle wrench*1