The Surf and Rail Adapters fit and mount to any skateboard - Designed and Assembled.Experience 3x tighter turns, smooth high speed pumping, improved flow, maximum deck articulation across front and rear, and increased grip around curves for all 4 wheels.Enhances truck performance for a skateboard, longboard, or drop-through board.Transforms a regular or reverse kingpin truck into a surfskate truck - great surf trainer Colour:redMaterial:Aluminum alloyPackage Contents:1 * Rear Truck - Rail AdapterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.