• These Helical Flute Taper Pin Reamers are used for reaming holes into which standard taper pins will fit. • Manufactured with a taper of 1/4" per foot. • The straight flute design draws chips back toward power source. • Spiral point used for hand reaming of difficult-to-ream materials. • Helical flute reamers are suitable for use in machine reaming, because they throw chips forward. • Suitable in a variety of normal ferrous, non-ferrous and non-metallic materials.