This is a spinner nut set from OS Engines for the OS Max 60FP, 61FX & 65LA.
It gives a more realistic look to vintage models, such as a Piper Cub.
FEATURES: Polished aluminum construction
Included tool for installation
Prethreaded for 5/16" crankshafts
INCLUDES: One spinner nut
One steel rod, to tightened down the nut during assembly
REQUIRES: Itstallation onto crankshaft
SPECS: Length: 26.8mm
Diameter: 18.7mm (.74"), tapering to 16.8mm (.66")
Internal threads: 5/16"
COMMENTS: This will also fit any OS engine with 5/16" crankshafts.
A 21mm open-end wrench can be used installation.