Bought this and another Spyder bit at a time for installing jigs in drywall and 3/8" plywood. BOTH are just the worst bits I've ever tasted. both are extremely unbalanced to the point where they are dangerous to use. I've tried 2 different corded drills, my old Hole Hawg and the new Dewalt. No difference, DO NOT TRY TO USE ANY OF THEM WITH A CORDLESS DRILL - you could break something (e.g. yourself. If you put it on a flat surface and check with a ruler you can see that it deforms This makes them impossible to use and get a good decent hole in. I can't believe any company would miss out on quality like this .out the door.
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