Shepherd Hardware 3664 Blue Diamond TPU Wheel Caster, 4 InchThe Shepherd Hardware Blue Diamond TPU Wheel Caster give mobility to heavy loads on smooth, hard surfaces and finished concrete floors where quiet movement and floor protection are major considerations. Highlights: Color : Blue 4 inch Diameter 300 lb. load capacity Double ball bearing swivel, black powder coated rig Features a foot activated total lock break that simultaneously stops the caster wheel rotation and swivel Offers soft and resilient non