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Power drill bits power drill bits, namely, jobber length drills, screw machine length drills, extra length drills, reduced shank drills, carbide-tipped drills, hex shank drills, hole saw pilot drills, single and double end body drills, wood working drills, space drills, silver deming bits, and router bits; bits for power cutting tools; circular blades for power saws; drill sets for hand-operated power tools consisting of groups of drill bits and cases therefor