Listing is for one (1) Service Caster Series #04 heavy duty low profile business machine 1-5/8" expanding stem swivel caster. Featuress a 35 mm (1.4") diameter by 27 mm (1.1") wide wheel, a 92 Shore A durometer polyurethane tread on steel core and precision ball bearings. Supports 220 pounds (lbs.) per caster. When searching for a reliable and durable solution for your business machine needs, consider Service Caster?s low profile polyurethane casters. The Service Caster 04 series is ideal for copiers, business machines, vending machines, displays, computer storage devices, and electronics cabinets. The low profile design allows for an unlimited amount of uses where casters are a necessity without raising the unit further than necessary. Featuring polyurethane tread wheels on a steel core, with precision ball bearings and a zinc plated finish provides durability under any condition. Mounting options include top plate, grip ring, standard and metric threaded stem sizes. Also, the innovative expanding stem, that can easily adapt to the inside diameter of an opening, allowing for a secure fit in round or square tubes.