Caster Kit • Work Table Pop Box • Includes (4) 5" Diameter Expanding Stem • Fits 1-5/8" OD Tubing • Non-Marking Polyurethane Tread • Top Lock Brake • 300 Lb. Capacity • Resistant To Acids And Caustics • Double Ball Bearing • Operational Temp Range -45º To 180º F • Zinc Plated