A quality flat belt pulley measuring 8" diameter by 5" wide (approx), with the centre machined to suit a 1.5" shaft diameter as found on many Lister and Petter stationary engines.
The pulleys come complete with a either a parallel key or a key locking bolt depending upon stock availability. Original looking, heavy duty pulley.
The picture is for representation purposes only. Final design may differ in style depending on stock but the dimensional accuracy is consistent.