... cover also. Welcome to contactwith us.Company InformationsDetailed Product Description Caster: 1.Wheel:PA,PU tyre+PP core 2.Diameter:50mm3 ... .Mounting: top plate,threaded stem,grip stem,bolt hole Caster Features:1.caster: swivel caster without brake2.PU: excellent anti-abrasion,floor protection ... shop,supermarket, etc. Workshop Special Test MachinesCertifications furniture twin nylon caster with brake