40mm Prop- 4mm Thread

M4 props

Very rigid black fiberglass-filled high pitch nylon props made only for racing boats. There are two types: props to fit the 4mm Graupner shafts and props to fit 3/16" "Drive Dog" shafts (as used by Octura and others). Use GR2321 Drive Dog to adapt these to Graupner 4mm shafts.