Single-spindle, single speed 1/2 HP polishing motor.  Features an open casing for resistance to overheating covered by a filter to protect internal parts from rouge and metal dust. The Cool Blue Motor draws air on one side and discharges on the other. This reduces motor heat and debris that can cause wear to the bearings. Replaceable filters can be sent to your refiner to reclaim gold dust. Has 1/2" diameter straight shaft and is supplied with one 4.5" tapered spindle with set screws. Made in Mexico.