Features:Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte FinishFriendly Hex Screws with Retention Features and Full Length Locking Plate to Guarantee Easy Installationand Secure FitFits All Picatinny/Weaver RailsSpecifications:Material: AluminumPieces: 2Rail Type: Picatinny/WeaverProfile Level: High, Medium and LowRing Diameter: 30mmRing Width: 21 mmMax. Scope Outer Dia.: 74 mm, 48 mm and 58 mmScrews Per Ring: 4