4" Kingpinless Caster | Swivel Plate Caster | Poly on Iron WheelPlate Size: 4" x 4-1/2"This listing is for a 4" x 2" Kingpinless Caster combined with a Heavy Duty Polyurethane on Cast Iron Wheel. Choose Brake and / or Bearing options using the right hand side drop down boxes to customize this caster. The caster yoke can hold up to 2,000 lbs but the Polyurethane on Steel Wheel only allows 700 lbs per caster. If you need more weight capacity please check out our other listings combined with different wheel materials.