Listing is for one (1) Service Caster Series #20 swivel caster with a 3-1/2" diameter by 1-1/4" wide blue polyurethane wheel and a bolt hole capable of supporting 250 lbs./caster.When searching for a reliable and durable solution to your caster needs, consider Service Caster?s Series 20 bolt hole polyurethane casters. The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects. The bolt hole can accept a bolt or a customized stem, allowing for any type of mounting requirement. The zinc plated finish provides durability under any condition, while the non-marking, non-marring polyurethane wheels perform especially well on hard surfaces such as concrete, tile, and wood. All rolling on a finely crafted ball bearing design that will keep you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.