The UTG 30mm/2pcs low 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 - rail type: Picatinny/Weaver - profile level: low - ring diameter: 30mm - ring width: 21 mm - max. Scope outer Dia: 48 mm - screws per ring: 4