BSA Adjustable-Height Rings, Aluminum, 5/8" Weaver-Style: * Fit most 5/8" Weaver-style or picatinny type mounts * Includes 1 adjustable aluminum ring and 2 adjustment blocks for low, medium and high mount settings * Dimensions: 6.2"L x 1.8"W x 6.6"H * Model# BSAARA