This 6" x 2" Chrome Plated Spring Loaded Caster can effectively absorb shock and protect products from damaging vibrations on rough or uneven floor conditions. The solid polyurethane spring, unlike the common metal spring, resists corrosion and elastic fatigue. The Swivel rig uses Thrust Bearings to replace regular ball bearings, which can support high axial force and provide a ultra smooth raceway operation making it much easier to manually move the Carts or Equipment. Chrome plating increases the surface hardness and durability while reducing the repair and maintenance costs. The C48 spring loaded casters are recommended for the automotive industry, medical equipment, computer equipment or any other shock sensitive load. This is our Ergonomic Spring Loaded Caster which is designed to reduce the push/pull force to manually move your cart or equipment which helps reduce operator back strain as well as reducing worker comp claims.