... kezhi new type -med heavy duty industrial caster Med-Heavy Duty Caster /Three Size available (3'',4'',5'') ... 3.Caster material: PU wheel tyre with pp wheel core, black color plated, Top plate swivel housing ... steel , flourish casting pp core .4.Top plate swivel brake type ,fixed type ,brake ,threaded stem , ... size available in M16*35/M14*30/M20*40mm High shock absorption/High abrasion resistance/ High ...