Made from recycled materials. Processed using renewable solar energy generated on-site at our Madera, CA facility. Returnable at end of life to ensure cradle-to-cradle handling. Furnished in copper-free aluminum (Type 6061-T6), brass (Type 360) or stainless steel (Type 304). Cap fully machined from solid billet with 11/16" opening. 360° rotation for precise optic positioning. Tamper resistant, stainless steel set screw.