Hamilton Extra Heavy Duty Dual-Wheel Swivel Caster with 12" x 3" DuraGlide Wheel 1" thick Polyurethane (95A) Wheels with 3/4" Sealed Precision Ball Bearings
Bolt Hole 1: 4 1/8 x 6 1/8
Bolt Hole 2: 
Bolt Size: 0.38
Caster Rig Type: Integral Forged Kingpin
Caster Type: Swivel
Color: Crimson Powder
Wheel Color: Gray Poly On Black Center
Diameter: 12
Overall Height: 14.5
Top Plate: 6 1/8 x 7 1/2
Top Plate Length: 7.5
Top Plate Width: 6.13
Wheel Face: 3