For Fabricator^® Sewing Machine owners who want to gear down their machine for leatherwork, pair this cogged motor pulley with the 42" cogged timing belt (#120580). The resulting re-gearing allows the Fabricator to sew with incredible slowness and precision. At the slowest speed setting, you can achieve a sustained super-slow sewing speed of 70 stitches per minute with the pedal down — or sew even slower by adjusting your foot pressure on the pedal. When the motor is programmed to the highest setting, the maximum sustained speed is 640 stitches per minute.