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Those are kreg bits, made for the kreg jigs which allow you to put a screw into a 90degree joint at an angle from inside...completely hidden on the outside.
Don't recommend those bits for plug making they are very dangerous...the centers are small and have a tendency to catch and break...can do some damage beware.
There are two styles, one has a flat bottom on the larger size, one has the standard taper for a wood screw.
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Threaded Mode