Wheel material: Red polyurethane bonded to a cast iron or steel core
Caster type: 360° swivel
Wheel sizes: 4", 5", 6", or 8" diameter
Load capacity: 300–2,500 lb (135–1,135 kg) per caster, depending on the size and model
Bearing: Roller or precision ball bearing
Mounting: Top plate
Frame: Heavy-duty zinc-plated or forged steel