This center pulley is designed as a general-purpose replacement for the OF16 S-L, OF16 S-H, OF16 Pro. This center pulley 14 toothed also fits the OF20 S-L, OF20 S-H, OF20 Pro series built before April 2015. This pulley has a profile of HTD 3mm and has 14 teeth. The inside diameter is 1/4'', and it has a belt width of 0.23622''. It requires Belt Retainer Plates, part #603775 (set of 3) to be on the machine.