... : 4"5"6"8" 4,Small order accepted White PP heavy duty caster,fixed,swivel,brake.1.Load capacity: from 300kg up ... .3.Caster material: High quality White PP,smooth tread wheel with double ball bearing. Solid steel welded construction,zinc plated,dustproof ... seal.4.Matches with different fittings such as swivel, fixed or side/total brake ...