This product is compatible with the original number #21562

Alum. 12mm O-Ring Fixed Wheel Adapter 
Features:
1.Innovative increase O-ring
Compared with the original product, increased O-ring fixed locking pin, effectively preventing the hexagonal Wheel Adapter and locking pin in the maintenance of falling off, enhance the fixing force of the adapter.
2.High strength aluminum alloy material
Made of high-strength aluminum alloy, the adapter has excellent strength and durability.