Tap Drill Set, National Coarse Thread, 5/16-In. X 18-Fast Shipping

Description

5/16″ x 18, national course thread, tap & drill set, carbon steel, ideal for routine maintenance, repair work & for rethreading where high accuracy & tolerance thread is not critical, straight flutes are ground to provide rapid chip removal for efficient threading, designed for hand threading work in a variety of materials taps produce a class 2b thread, includes letter f drill bit.