Swivel castor with total lock, tail end of castor, housing made of pressedsteel, bright zinc plated, blue passivated, double ball bearing swivel head,bolt hole. Wheel centre made of Polypropylene, electric conductive,Tread: TENTEprene (thermoplastic rubber), grey non-marking, plainbearing Castors can be mounted with standard screws, various lengthscrews can be used.