The UTG 1 inch/2pcs medium profile Picatinny with Weaver rings. Features: - precision machined from aircraft-grade aluminum alloy with anodized black matte finish - friendly hex screws with retention features and full length locking plate to guarantee easy installation and secure fit - fits all Picatinny/Weaver rails. Specifications: - material: aluminum - pieces: 2 - profile level: medium - ring diameter: 1 inch - ring width: 21 mm - max. Scope outer Dia: 53 mm - screws per ring: 4