Universal Stainless Steel Motorcycle Cup Holder. Mounts to just about any round or square tube from 3/8" to 1-1/2" in diameter. May also be used for bicycles, ATVs, boats and lawn chairs. Features chrome-plated mounting hardware with rubber liner, foam cup insert, drainage hole, and hex key wrench plus extra screws. Holder measures 3-1/2" diameter, 4" height.