Tenders for Supply of Heavy Duty Swivel Castors Generally To Is 7369/1983 With Two Ball Bearings One For Swivel Action And Other For Taking Thrust Loads In The Swivel Head Fitted With Poly Urethene Wheels Moulded On Cast Iron Core Equipped With Sealed Ball Bearings No: 6205Zz. Size: Od Of Wheel: 200Mm, Hub Length: 60Mm, Thread Width: 50Mm, Total Castor Height: 250Mm.