Precision Machined For The Ruger American Rimfire This one piece scope mount is precision machined from billet aluminum by Ruger to fit the receiver of the American Rimfire as closely as possible. Made to standard Picatinny specifications this mount accepts both Picatinny and weaver style rings. Made from a single piece of aluminum and includes the four TORX screws required for mounting. Paragraph Two Specifications and Features: Ruger: 90674 Picatinny Scope Mount Base Accepts Weaver And Picatinny Bases Length: 6 Inches Color: Black Includes: Picatinny Base Mounting Screws Fits: Ruger American Rimfire