The straight-flute design is recommended for most general purpose reaming.
They are regularly pointed with a 45º chamfer. The right-hand spiral-flute reamer has the smooth, chatter-free action necessary for fine finishes. 19/32" HSS Taper Shank Straight Flute Chucking Reamer It is recommended over the straight-flute for more difficult materials, better surface requirements, and applications with an interruption such as a keyway or cross hole.