Irwin 1788673 Fractional Tap, 1/4 in- 28 NF Thread, Bottom Tap Thread, HCS

Fractional tap 1/4 in - 28 NF, No 7 Self aligning taps, ideal for routine maintenance, repair work and for rethreading where high accuracy and tolerance thread is needed. Used for hand threading work in a variety of materials, produces class 2B thread. Tap size and recommended drill bit size is laser etched on each tool for easy identification.