The SOLUS Chassis Picatinny/ARCA Spigot Mount offers stable forward mounting with both Picatinny and Arca Swiss interfaces. Machined from a single piece of anodized 7075-T6 aluminum for durability and rigidity. Features bolt-on mounting. Specifications: Length 5.5 inches; Mounting Type Picatinny/Arca; Material 7075-T6 Aluminum; Finish Anodized Black; Made in America: Yes.