Self Aligning Tap & Drill Set, National Coarse, 3/8-In. x 16

3/8" x 16, 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 #36 drill bit letter o drill bit.