For most models of for HSP/GO/SH 1/10 1/8 RC, the 16-21 class engine of the oil car can be used universally (please confirm that the size of your engine back cover is the same) for HSP old engine 16 and 18 can not General. When using the hand puller, please do not pull the rope to the end, so it is easy to pull the rope off or can not shrink back. If the rope is not smooth during the pulling process, you can apply the lubricant. Center hole distance is: 27mm Diameter of the opposite side of the installation of the one-way bearing: 12mm. Tool Supplies: Assembled class Remote Control Peripherals/Devices: Motor Use: Vehicles and Remote Control Toys Wheelbase: Upper Shell For Vehicle Type: Cars Upgrade Parts/Accessories: Frame RC Parts and Accs: Engines Material: Composite Material colour:black Package Contents: 1 * for HSP Engine Hand puller Only 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.