This is the Male Joint Ball that works with Marine Universal Joints.
This joint ball mounts onto the boats 4mm drive shaft at the engine.
It accepts a 4.0mm drive shaft.
Designed for use with O.S. Max .21FSR-M, .21SE-M, .21VF-M and .21EX-M engines.
Black joint with silver pin
One Universal Joint with 4x4mm set screw
2mm hex wrench to tighten set screw onto drive shaft.
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