This WMS racing sprocket hub is precision machined, lightweight, and a proven winner. 
High quality aluminum racing sprocket hub.
 
Anodized black
Bolt Circle: 5-1/4"
Threaded Bolt Holes: 1/4-28 (6)
1/4" keyway
1-1/4" Bore
 
Sprocket Mounting Hardware NOT Included (Order our part #SGBKF for hardware)