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1/4" x 1/4" x 1 7/8" long Brass key-way. This is the prefered key for tapered shaft ends, and rudder posts. The key cuts and files easy for custom lengths. I am a firm believer in Brass vs Stainless after seeing a brass key shear in a prop after hitting a log saving the prop and drive shaft!
Always check to see that your key slides freely inside the prop key slot and the shaft key slot (or rudder) if not use a flat hand file, lay the file on a flat table and carefully slide the key over the file on each side until the key passes in/out of the prop/shaft slot without "sticking". There is a "fine line" between a smooth fit and a sloppy fit which is why I do not use a grinder.