This is the Master Airscrew Nylon K series 12x4 Propeller.
FEATURES: Designed for 4-stroke engines but works fine with 2-strokes as well
Wider blades and thinner airfoil sections maximize efficiency for
slower turning 4-stroke engines
Constructed of glass filled nylon
INCLUDES: One 12x4 Master Airscrew Nylon K series propeller
REQUIRES: Installation on engine crankshaft
If prop reamer is required the Great Planes reamer for standard size
crankshafts (GPMQ5006), or Metric size crankshafts (GPMQ5007) can
be used
SPECS: Size 12x4 (30x10cm)