Description: Easy Wheel & Extension Rod & Spacers, easy to install, very smooth and for long time serving. CNC machining, the wheels using big bearing for better durability and smoother rolling. Made of aluminium alloy, rugged, practical and lighter. Professional design for folding bikes, suits for folding bike modification, walking/ parking wheel. Great for replace the old or damaged easy wheel and extension rod. Specification: Material: Aluminum alloy Wheel Diameter: 60mm Rod Thickness: 17.5mm Rod Hole Diameter: 6mm Rod Installation Length: 117mm, retractable length: 81mm Rod Total length: 270mm Spacers Size: Outer Diameter: 16mm/0.63inch Inner Diameter: 10.5mm/0.41inch Package Includes: 1 Set Easy Wheel & Extension Rod 10 Pieces Easy Wheel Spacers Note: 1. Please allow a slight color difference between the real item and the pictures due to the difference between monitors. 2. Please allow a slight measurement error. Hope for your kind understanding and have a nice shopping day!