Workbench Caster kit 4 Heavy Duty Retractable Casters with Urethane Wheels Designed to Lift & Lower Workbenches Machinery & Tables 840 lb Total Weight Capacity. 4.6 out of 5 stars. 223. $39.99. $39. . 99 ($10.00/Count) Get it as soon as Wed, Jun 9. FREE Shipping by Amazon.