Custom Black Billet Metal 4" Round Replacement Motorcycle Motorcycle Mirrors Pair for Kawasaki KZ550, KZ650 Black, billet, large 4" round motorcycle mirrors. Sold as a pair (two pieces) Mirror housing and stem are 6061-T6 billet alumium metal-100% metal-no plastic whatsoever. Mirrors are 100% weather proof. Mirror lens is 100% distortion free glass and fully adjustable-allows you to move the lens up, down, left, and right. Mirror stays in place via a lock nut which attaches the mirror head to the mirror stem and prevents it from getting loose. Dimensions: Diameter of glass lens (horizontally): 4.25" (108mm), Length of stem (not including threads) diagnolly: 7.5" (191mm), Height of mirrors: 10 inches (254mm), Length of threads: 1/2" (13mm), Size of threads: 10mm metric 100% Money back guarantee! No questions asked!