1、Function: The ribbed wobble grey roller is designed to help you in loading your boat onto your trailer without scratching or damaging your boat. 2、Dimensions: Outer diameter of ribbed wobble roller is 5in/12.7cm, height is 3in/7.62cm and the installation inner diameter is about 30mm/1.18in. 3、Universal Fitment: Ribbed wobble roller has wide range of applications, suitable for boats, marines, yachts, trailer and so on, practical accessory. 4、Durable Material: Wobble roller is made of premium ABS and rubber material, sturdy and durable, high temperature resistant, not easy to break. 5、Ideal Replacement: Elaborate manufacturing technology, has high reliability and stable performance, direct replacement for the old or broken one. Item Type: Wobble Roller Material: ABS + Rubber Outer Diameter: Approx. 5in/12.7cm Height: Approx. 3in/7.62cm Installation Inner Diameter: Approx. 30mm/1.18in Application: Boats, Yachts, Trailers 1 x Wobble Roller