About this item 1 inch quick release scope rings fit 20mm dovetail mounts,rails and bases scope rings 1 inch fits standard 20mm Picatinny rail, aluminium alloy construction with a matte black finish Scope ring with quick detach/lock lever with full adjustability to fit on any picatinny rail High profile scope rings(item height:2.12″/54mm),the height from the center of the riflescope tube to the picatinny base is 1.3inches(33mm) Medium profile scope rings(item height:2″/50mm),the height from the center of the riflescope tube to the picatinny base is 1.1inches(28mm)