Shaver offers a broad range of tractor mounted, PTO powered diggers. The "scaled down" 101 model will fit most sub-compact tractors. Auger sizes range from 4" diameter for drilling pilot holes, up to 12" diameter for the Model 101, and all augers sized for the 101 are semi-double-flighted.
You would expect the company with the first name in post drivers to offer a full range of post hole diggers as well. Shaver has been manufacturing post hole diggers for many years. In today's competitive market place the Shaver post hole digger stands out for quality, affordability and reliability.