This listing is for a 6" x 2" Kingpinless Swivel 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 1200 lbs per caster. If you need more weight capacity please check out our other listings combined with different wheel materials. Features Heavy Duty Hot forged ASTM 1045 steel Industrial Design eliminates problems associated with standard kingpin failures due to severe shock loading and abuse Mounting Plate and inner raceway are integrally forged construction Highest Quality Precision machined and induction hardened sealed raceway provides exceptionally smooth performance Upgraded 3/8” Diameter HRC45 steel ball bearings absorb thrust and load in severe environments Double welded legs for added strength and durability Rigids version casters are manufactured from 8 mm thick steel Assmbled with 1/2” Diameter Zerk axle & lock nut