The Diamond Plate(tm) Universal Stainless Steel Motorcycle Cup Holder is versatile enough for just about anything you might want to connect it to. 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. Gift boxed.