Metric Tap And Drill Bit Combo Pack. Letter, Numbered Or Fractional Corresponding Drill Bits Combined With The Metric Tap. Brite Industrial Drill Bits Feature Premium Grade High Speed Steel For General Purpose Drilling Wood, Metal And Plastic. No Center Punch Needed: Century Quick-Cut Points Are Self-Centering And Penetrated Faster With Less Pressure, Will Not Walk Or Wander At The Starting Surface. Ground Flats On The Shank Provide Tight Chucking, Even With Keyless Chucks. 4X Life Rating In Comparison To The Average 135 Degree Point High Speed Steel Drill. Metric Taps-Plug Style. Precision Cut Internal Threads, Accurately Formed For Consistent, Exact Threading. Carbon Heat Treated And Tempered For File Hard Threads, And Longer, Useful Life. Designed For Hand Cutting Applications.