Listing is for one (1) quick release caster pad for Service Caster Series 30 casters or for most casters that feature a 4" x 4-1/2" top plate. When searching for quick and easy removable caster solutions, consider Service Caster's Quick release caster pad for Series 30 Casters. Caster pads can be welded to the application and will allow casters to be added and removed quickly and easily with a single bolt. This item removes the need for obtrusive bolts into the application. Excellent for dumpsters and steel flatbed carts. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.