Self Aligning Tap & Drill Set, National Coarse, 1/4-In. x 20

1/4" x 20, national course, self aligning tap & drill set, performance threading system self aligns tap in pre-drilled hole especially in irregular surfaces or through holes, carbon steel, ideal for routine maintenance, repair work & for rethreading, straight flutes are ground to provide rapid chip removal for efficient threading, designed for hand threading work in a variety of materials, includes #7 drill bit.