For general purpose tapping in a wide variety of materials. Spiral point makes less chip clogging and loading in the flutes. Can be used in blind and through holes. SIZE: 1/2 -13; MATERIAL: HIGH SPEED STEEL; FINISH: UNCOATED (BRIGHT); STYLE: SPIRAL POINTED; CUTTING DIRECTION: RIGHT HAND; FLUTE TYPE: 5021253; TAP SIZE: 1/2″; THREADS PER INCH: 13; THREAD STANDARD: UNF.