This is the motor coupler for the Minimono boat from AquaCraft.
Features: Aluminum construction
Includes: Motor coupler with three set screws
Requires: Installing between drive cable and propeller assembly, 1.5mm hex wrench for set screws
Length: 26mm (1)
Diameter: 8mm (.3), Accepts a 3mm (5/16) shaft on one end and .5mm (.019) on the other