The controller amazed me in usage. As a hookiest turning scrap into useful items, I used a DC lawn mover scrap motor in conjunction with this controller. Results made me happy because one motor speed variation can do several tasks. Cutting metals, plastics, grinding various items, polishing etc. Only 5/8" arbor added to motor shaft by installing under a table though hole. Rest is yours to get any specified tasks under your design assembly....I recommend this DC controller for brushed motors. Thanks