These Crush Tubes provide an ideal replacement part for your kit supplied items.Features:Precision manufactured for an accurate fit to the motor shaft of your vehicle - To be used on motor shafts with a 5mm diameter - Prevents the pinion moving towards the motor if the set screw comes loose - Produced from steel for long-term durability SPECIFICATION Internal Diameter: 5mm External Diameter: 7mm Length: 5mmIncludes:2 x Crush Tube 5 x 7 x 5mm