No holes. Includes the 1" splined sleeve and wheel mounting hardware required to be bolted or welded to a 3/4" O.D. steering shaft. Splined sleeve has one tooth omitted for indexing. Hubs are CNC machined from billet 7075 aluminum and hard coat anodized for durability.
Installation - Service instructions can be found on Service Bulletin #0041.
 
Manufacturer: Mark Williams Enterprises, Inc.