Weaver Picatinny riser 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. By adding an optimal 1/2-inch of rail height, the Weaver Picatinny Riser Set is a sleek, lightweight option for mounting a wide range of optic and ring combinations. This riser set also features an additional mounting slot so you can position your optic exactly where you need it. Made of aircraft-grade 6061-T6 Aluminum with Type III hard coat anodized finish, this accessory is built for duty.