Listing is for one (1) Service Caster Series #04 heavy duty low profile business machine 10 mm diameter – 1.50 TPI x 1-1/2" long threaded 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.