Irwin Industrial Tools 4935352 SAE Alignment Taps 4 to 1/2-Inch with NC and NF Thread Pitches,IRWIN,4935352" /> Tap set includes Performance Threading System taps Self-Aligning taps start and thread straight every time Chip breaking technology cuts chips easier Includes #4 - 1/2" taps with SAE measurements Contains 16 taps from No. 4 Machine to 1/2-Inch with National Corse and National Fine Thread pitches The self aligning taps feature a redesigned chamfer that allows the tap to align itself in the hole to create straight threads 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