Heavy duty castor, swivel type, with galvanised-chromated fork made of sheet steel and double row ball and cage assembly in the fork head, mounting with screw-on plate. Installed wheel B15, B16, B60, B61, B80, B81, B83, B90 or C10, with roller bearing or ball bearing and tread made of plastic, cast polyamide, elastic rubber, Besothane cast polyurethane or Prothane® cast polyurethane.