All steel construction 4" dia. x 1-3/4" wide 6" dia. x 1-3/4" wide Sealed bearings (no grease fittings) 4" wheels have 3000 lbs. capacity 6" wheels have 5000 lbs. capacity 4" model includes 1/2" bolt and nut 6" model includes 1/2" bolt and nut Gold/zinc plating Maintenance free
| Item Number | Size |
| HA40 | 4" Diameter |
| HA41 | 6" Diameter |