Listing is for a set of four (4) Service Caster Series #30 casters, two (2) swivel casters with side lock brakes & bolt on swivel locks and two (2) swivel casters with a bolt on swivel locks, with 8" diameter by 2" wide phenolic wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 5,000 lbs. (1,250 lbs./caster). When searching for a reliable and durable solution to your caster needs, consider Service Caster Series 30 phenolic wheel casters. The Service Caster Series #30 is ideal for medium and heavy duty material handling, carts, equipment, and shop projects. The zinc plated finish provides durability under any condition, and the phenolic resin wheels are highly resistant to impact damage, providing protection for floors in commercial and industrial settings. Not only are they resistant to water, oil, and grease, but because they are non-metallic, these wheels are spark proof, keeping you safely moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.