The Tiny-Clutch 2425 Winding Clutch is based off of our AD50 Autodisconnect Clutch. This clutch features a larger 5/8" | 15.9mm plain drum with two flats for the output hub, allowing quick, easy slip fitting of the driven load. This clutch also has the drag arm reversed, to allow different mounting clearances. If you have special needs for your application please Let Us Know.