Manual number:

This product includes :

Stainless Steel Screw Shaft M4*2.5*11.8 -- 4pcs
5mm Spring Steel Shims - 4pcs
5mm Iron Washer - 4pcs
Stainless Steel Hex Socket Screw 11mm - 2pcs
Stainless Steel Hex Socket Screw 10mm -2pcs

Product major function & usage:

Connect with front CVD and rear drive shaft with wheels

Reduce the gap and closer to the wheel, extend the wheel-base by widening the width of the hex.

Easy to plug and play with assorted colors to choose from, increase the stability of the vehicle

Original Hex Adapter : 5mm
For front : 9mm Hex Adapter
For rear : 12mm Hex Adapter
The vehicle is more stable with wheel-base wider on the rear than front.