Lion Gears BM1210QR Hunting Club/Shooters Club/Bear Hunt/Wild Hunter Bridgemount Riser, Black, 1"/5" Dual lock quick release/lock lever makes the width fully adjustable to fit all pictatinny rails Robust and light-weighted design with steel-to-steel connection between screw and locking nut plate Precision Machined solid aircraft grade aluminum with hard Anodizing for tight tolerance and durability See-thru design with Pica tinny/Weaver mounting base