17mm hex hubs decrease the stress on the wheels, helping to prevent stripped wheels when using high horsepower engines and motors. Super Heavy Duty steel axles are used for durability, machined lightweight aluminum hubs and wheel nuts are used for quick acceleration and anodized orange and black respectively for a custom look. Designed for Savage cars using Super Heavy Duty Dog Bones and Diff Shafts. If you Savage is not already fitted with these, then you also need the following parts to complete the conversion: 2x #86246 - SUPER HEAVY DUTY DRIVE SHAFT 11x123mm (2pcs) 2x #86248 - SUPER HEAVY DUTY DIFF SHAFT 9x11x34mm (2pcs) Set includes: 4x #160136 - Super HD Axle 8x11x42mm 4x #160138 - 17mm Hex Hub Adaptor (Orange) 4x #67492 - 17mm Wheel Nut (Black) 4x #Z272 - Pin 2.5x17mm 4x #Z740 - Set Screw M5x4mm