Features Double Bearings: The swivel caster wheel has built in double bearings, the wheel core is in the center, with stable rotation. Cast Iron: Made of excellent cast iron material, with high hardness, wear resistance and long service life. Stable Structure: Widened and thickened design, load bearing and more labor saving, there will be no unevenness of the equipment. Standard Size: The mounting height of the casters is 97mm, with standard openings, quick and convenient installation. Wide Applications: Rubber caster wheel diameter is 3in, often used for replacement of wheels on household cars or trolleys. Specification: Item Type: Swivel Caster Wheel Product Material: Cast iron Plate Size: Approx. 64 x 94mm / 2.5 x 3.7in Wheel Diameter: Approx. 74mm / 3in Wheel Width: Approx. 28mm / 1.1in Installation Height: Approx. 97mm / 3.8in Product Color: Black Use Scenarios: Airports, hotels, warehouses, trolleys Package List:1 x Swivel Caster Wheel Package List 1 x Swivel Caster Wheel