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