Part location: Center of wheel
This product includes :
3x3.5mm Stainless Countersink Washer 4pcs
Stainless metal Flat mind Screw 3x12 4pcs
Major features of updating to this part/product:
1. The first wheel hub diameter is 3.5mm. You will see gap if install with exclusive 3mm screws. This system can fit better.
2. Original installation is always to fix straight by screws, the product has upgraded to fixing by countersink washer and screws. This can stabilize the wheel better.