4 off Steam Valve Wheels 1.5 inch/Foot scale TGR M

This 4 x valve wheels for Tasmanian Government Railways M and H class locomotives. in 1.5"/foot scale (1:8) for 5" gauge track. From M class drawing 56. These were used as injector water valves and injector steam valves (main shut off on the turret) and ejector main steam valves. 
This works out around 15.8mm diameter, with a 2mm square in the centre. it is about  3.1mm thick. It is a good size for many 5" gauge locos and could easily  be fitted to commertial valves.