Component location: Center of wheel
This item includes :
3x3.5mm Stainless Steel Countersink Washer 4pcs
Stainless metal Flat mind Screw 3x12 4pcs
Major features of upgrading towards part/product:
1. The original wheel hub diameter is 3.5mm. There will be gap if install with unique 3mm screws. This product can fit better.
2. Initial installation should be to fix straight by screws, this system has upgraded to fixing by countersink washer and screws. This might easily offer the wheel better.