Hyperion LONG 5mm Collet Prop Adapter with M8 threaded shaft. Beautifully made, precise collet prop adapter from Hyperion, at a reasonable price. This is a large, strong adapter for props in the 10" to 22" range, with 8mm center hole. Made to fit 5mm motor and gearbox shafts, with sufficient length to mount large APC E and SPORT props, and also a spinner if desired. 3mm hole in end of adapter allows mounting of various aluminum spinners.