Machine Screw and Fractional Plug Taps. Precision Cut Threads, Accurately Formed For Consistent, Exact Threading. Heat Treated And Tempered For File Hard Threads, And Longer, Useful Life. Designed For Hand Cutting Applications. For Use With Tap Wrenches To Cut Internal Threads. 75% Thread Engagement. Plug Style Is The Most Commonly Used Style Of Tap -3 To 5 Threads Chamfered. Drill Bits Brite. 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 118 Degree Point High Speed Steel Drill.