Front Bolt Thru Complete Hub. 
 
Key Features:
Used on GENV and Pluribus Row Units
Uses heavy duty tapered roller bearings
Dawn standard 6-bolt hole pattern
Has intergrated grease zerk
 
Specifications:
Doesn't come with mounting hardware
Bolt Thru Hole Diameter - .65 in
Bolt Circle Diameter - 5 in
Bolt Hole Diameter - .39 in 
Hub Pilot Diameter - 3.77 in
Pattern - 6 Bolt