... : 75mm,100mm, 125mm3.Caster material: Hard rubber with delrin bearing,pressed steel,zinc plated,double ballrace swivel head, transparent dustproof seal4 ... available 5.Matches with different fittings such as swivel, fixed , double brake ,threaded stem and solid stem 6.Plastic,thermoplastic ... us!3.Similar Product4. Factory 65 American type hard rubber caster threaded stem top brake caster nylon pedal