Mounts on Picatinny spec rails to provide an offset base for miniature dot sights, lights and accessories Aircraft-grade 6061-T6 aluminum with Type-III hard coat anodized finish These versatile bases from Weaver help give your gun a versatile edge. Multi Slot Bases are constructed of tough, lightweight aluminum so they can withstand the most powerful recoil.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }