industrial caster a.dia 40mm b.nylon or PP wheel, c.with M8*15mm,M10*15mm or 1/4",5/16",3/8" thread industrial swivel caster 1)dia40mm,2) PP wheel,3)with M8*15mm,M10*15mm or 1/4"*15mm,5/16"*15mm,3/8"*25mm thread,4) with ball bearing5)black, white colors are available;6)used for cabinet, trolley etc;7) loading25KGs per piece. FS40 industrial caster