Lion Gears BM1710 Hunting Club/Shooters Club/Bear Hunt/Wild Hunter Bridgemount Riser, Black, 1"/7" Precision Machined solid aircraft grade aluminum with hard Anodizing for tight tolerance and durability Robust and light-weighted design with steel-to-steel connection between screw and locking nut plate See-thru design with Pica tinny/Weaver mounting base