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Forstner-pattern bits are used wherever edge-holding ability is needed, such as in the overlapping holes of a mortise.

The razor rim allows the bit to hold perfectly, even if the brad point is over a void. Since the rim is several thousandths of an inch higher than the chippers, the bit enters cleanly and the double chip channels clear well.

The bit gives a cleanly cut, flat-bottomed hole ideal for plugging. A primary use for this bit in the woodworking industry is to drill out knots for later plugging.

Saw tooth bits (usually over 1" in diameter) are primarily for use in a drill press. They are most useful for boring smooth, clean holes in all wood varieties at any angle. The double chip channels are less subject to rim heat than forstners and are easier to sharpen. Although their edge-holding ability in overlapped holes is slightly less than forstners, the difference is negligible in drill-press use.

Lee Valley Design Features
 
Forstner Tooth Profile
 
Saw Tooth End Views

 
 
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