... wheel casterHousing:Made of pressed steel,zinc plated,double ballrace swivel headItem : 51XXXTWTPRBWheel diameter : 50mm,75mmWheel materials : Thermoplastic ... Wheel Caster that meets your mobility requirements.Housing: Made of pressed steel,Zinc plated,double ballrace swivel head, ... of following instruction may cause the damage on caster, physical loss of equipment or personal injuries.*Distinguish ...