Great Planes Collet Prop Adapter 6.0mm Input to 5/16x24 Output Convenient prop adapter to fit standard size propellers onto a 6 millimeter motor shaft. Features a large shaft size for brushless (or brushed) motors with smooth, non-threaded shafts. Includes (1) prop adapter, (1) prop washer, and (1) 5/16-24 prop nut