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 Optional Length: 12mm, 15mm, 17mm 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 .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1It effectively extends the width of your RC vehicle 2The metal hex adaptors are for a more evenly distributed load on drivetrain when compared to the plastic ones which is included with most kits 3It adds a touch of weight to your tires to improve grip 4It features a set screw locking that prevents it from falling out when exchanging wheels 5The set of wheel hub adaptors are suitable for cars whose hubs use 5mm hexes