BSA Adjustable-Height Rings, Steel, 5/8" Weaver-Style: * Fit most 5/8" Weaver-style or picatinny type mounts * Includes 1 adjustable steel ring and 2 adjustment blocks for low, medium and high mount settings * Dimensions: 5.5"L x 1.4"W x 6.0"H * Model# BSAARS