The photos in the listing show both the keyway and set screw. I have ordered three gears but have only received two in separate batches so far. I'll keep them and drill and tap with one set screw each. I am sure they will work great on the CNC plasma cutter I am building. I just hope the seller makes sure I get the third one and that he/she makes sure future buyers know what they are buying! 9-9-19. Now I have third gear! I will put them to good use.
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