Octura 3/16" (4.75mm) prop shaft fits .062 Piano Wire Designed to fit 3/16" lead Teflon bearings. The end of prop shaft measures 1/8" (3.17mm) in diameter to fit the smaller 1/8"(3.17mm) prop shafts. Measures: 2.25" (57.15mm) long Requires: .062 Piano Wire Part# oct-oc4d Drive DogPart# oct-oc4pn Bullet Prop Nut