Wheel casters like the 4inch-Lock-Swivel-Caster-011 are used to roll your built machine or equipment back and forth. This caster is rolled on a wheel that has 100mm diameter/3.937" inch inches. Dimensions of the caster wheel is 30mm (1.181" inch). The overall height of the caster is 130mm or 5.118" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 93mm x 62mm and holes distance of 45mm x 72mm. Low drag was achieved by a Thermoplastic Rubber core on a Thermoplastic Rubber tire spinning freely with a Double ball bearing. Each caster will carry the load of 198 lb and is Swivel and Upper Locking type. Temperature range = -40 to 180 F. Enjoy our 4inch-Lock-Swivel-Caster-011, we wish all the best in your project.