PROP REAMERS Often the propeller you want to use has a hole smaller than a shaft of the engine you want to use it with. Fox Reamers provide an easy and accurate method of enlarging the hole without splitting the prop or getting the hole out of the center. Fox Reamers are of standard four-flute design and fitted with a T-bar. The Metric is for 6mm, 7mm and 8mm shafts.