1. Top plate : 3-15/16" x 4-1/2" 2. Diameter : 4" / 5" / 6" 3. Tread Width : 2" 4. Load Capacity : (4" : 700 lbs/ea) / (5" : 1000 lbs/ea) / (6" : 1000 lbs/ea) 5. Overall height : (4" : 5-5/8") / (5" : 6-1/2") / (6" : 7-1/2") Introducing our Heavy Duty Caster Set with All Steel Wheels, providing robust performance for your mobility needs. This set includes 4", 5", and 6" diameter options to suit various applications. Enhance the maneuverability of your equipment with our reliable Heavy Duty Caster Set, built with durability and versatility in mind. Set Options: 4 Swivel 2 Rigid + 2 Swivel with Brake (2R + 2SB) 4 Rigid 2 Rigid + 2 Swivel (2R + 2S) 2 Swivel + 2 Swivel with Brake (2S + 2SB) 4 Swivel with Brake (4 SB)