Please read the description and check the pictures closely to ensure fitment. Features: The 12mm wheel hub is designed for 1/10 Crawler Car SCX10 WRAITH. Lightweight upgrade instantly enhances overall performance in handling and durability. Strong metal alloy for maximum performance. Extend the track width for a wider stance, better control and stability. Note: (CVD with steps is not suitable for this model), 727 cannot use this adapter This screw head diameter: 8mm 4WD D90 AX10 CC01, SCX10, F350 modification, widened wheelbase 1.9 can be changed to 2.2 Specifics: Material: Aluminum Alloy Total length: 15mm Hex size: 12mm Pin: 2*10mm Fit for: 1/10 RC Rc Crawler Scx10 Rc4wd Wraith D90 etc. Make sure your 4 wheels use a 12mm hub already Suitable for hub aperture 7mm Suitable for screwing on a 4mm axle screw Suitable for the hole in the axle is 2mm (if no hole these wont be suitable) Package Content (as pictured): 4 x RC Hex Hub Extension Adapter 4 x Nail 4 x Pin