Chrome Billet Large Round Rearview Motorcycle Mirrors 10mm Pair (2 mirrors) for Yamaha RD 250,RD 350,RD 400 Brand New! Chrome billet, large, custom, round motorcycle mirrors. Sold as a pair (two mirrors) Mirror housing and stem are 6061-T6 billet alumium metal & have three layers of chrome plating added to ensure a high quality shine. 100% metal-no plastic whatsoever. Mirror lens is 100% weather proof, and fully adjustable-allows you to move the lens up, down, left, and right. Dimensions: Diameter of glass lens (horizontally): 4.25" (108mm), Length of stem (not including threads) diagnolly: 7.5" (191mm), Length of threads: 1/2" (13mm), Size of threads: 10mm metric 100% MONEY BACK GUARANTEE! & WE SHIP FROM THE USA!