6061-T6 Aluminum CNC Machined Billet Construction. All stainless steel hardware. Convex automotive quality mirror glass. Fully modular assembly – every part is easily replaceable. Extension elbow is reversible for left and right side mounting. Will fit most 7/8″ bars and clip-ons. Intended to be used in conjunction with a left side mounted Hindsight or stock mirrors to help reveal blind spots. Optional Billet internal adapter for mounting on virtually any bar.