Wheel: 92 Shore A Non-marking Floor Safe Polyurethane on Steel Core - 35 mm (1.4") diameter x 27 mm (1.1") tread width Weight Capacity: 880 lbs Total Capacity (220 lbs/Caster) Threaded Stem Size: 8 mm diameter - 1.25 TPI x 1-1/2" long Overall Height: 52 mm (2") Find other wheel materials, sizes and all Service Caster products at our Amazon Storefront. Click on the “by Service Caster” link above the main title on any Service Caster page listing. Listing is for four (4) Service Caster Series #04 heavy duty low profile business machine 8 mm diameter – 1.25 TPI x 1-1/2" long threaded stem swivel casters. Features 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 880 pounds (lbs.) (220 lbs./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.