Features 1、It effectively extends the width of your RC vehicle 2、The metal hex adaptors are for a more evenly distributed load on drivetrain when compared to the plastic ones which is included with most kits 3、It adds a touch of weight to your tires to improve grip 4、It features a set screw locking that prevents it from falling out when exchanging wheels 5、The set of wheel hub adaptors are suitable for cars whose hubs use 5mm hexes Specification Features: It effectively extends the width of your RC vehicle. The metal hex adaptors are for a more evenly distributed load on drivetrain when compared to the plastic ones which is included with most kits. It adds a touch of weight to your tires to improve grip. It features a set screw locking that prevents it from falling out when exchanging wheels. The set of wheel hub adaptors are suitable for cars whose hubs use 5mm hexes. Specification: Material: Metal Color: Shown As Pictures Lock Tube Out Diameter: 5mm Fit: 4mm Out Diameter CVD Shaft Diameter of Screw Head: Approx. 8mm / 0.31inch Diameter of Screw: Approx. 5mm / 0.2inch Weight: 57.6 - 65.2g Fit: for Traxxas Hsp Redcat Rc4wd Tamiya Axial scx10 D90 Hpi Type: RC Parts & Accessories Package List: 4 * Set of Wheel Hub Metal Adaptors 8 * Link Rod Package List