The HM1 and HM2 series of power take-offs (PTOs) are designed to work with the most popular medium- and heavy-duty transmission applications up to 250 lb-ft. The HM1 series is for 6-bolt mounting and the HM2 series is for 8-bolt mounting. The PTOs come with mechanical or air shifting, direct or remote mount, several internal ratios, air-control valves, repair kits, and more.