Hamilton Mini-Mite Low Profile Swivel Caster with 4" x 3" Steel Roller with (2) needle thrust bearings and (2) needle roller bearings on a 1" axle.
Bolt Hole 1: 3 x 3
Bolt Hole 2: 
Bolt Size: 0.5
Caster Rig Type: Kingpinless
Caster Type: Swivel
Color: Battleship Gray
Wheel Color: Clearcoat
Diameter: 4
Overall Height: 6
Top Plate: 7 1/4 x 7 1/4
Top Plate Length: 
Top Plate Width: 
Wheel Face: 3