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Magnum Prop Reamer - Stepped for 5mm, 1/4, 5/16, 3/8 Propellers usually need some preparation before bolting them in place. Often, the center hole will have to be enlarged to fit the engine's crankshaft. Magnum's Reamers enlarge the center hole in your propellers perfectly and it works much better than a drill.
Stepped design for 5mm, 1/4, 5/16 and 3/8 holes.