Irwin Industrial Tools 4935056 SAE Plug Taps 4 to 1/2-Inch with NC and NF Thread Pitches,IRWIN,4935056" /> Contains 16 taps from No. 4 Machine to 1/2-Inch with National Corse and National Fine Thread pitches Features Irwins new chip Break Technology which makes breaking off chips 30% easier The increased Flute Taper makes the Taps 20% more durable Laser Etched Markings for easy identification High carbon Steel Construction