Mine borers; Collets for power tools; Laser engraving machines; Pneumatic hand-held drills; Drill sharpening machines; Bits for power drills; Power-driven wrenches; Radial drills; Nut-tapping machines; Drilling machines and parts therefor; Electric hand-held drills; Power drill accessories, namely, non-electrical adapters for use in joining extensions and power drill bits; Power-operated angle grinders; Machine tool holders