Turn these reamers with the long ratcheting handle, which provides more leverage than a T-handle.

Spiral Flute—Since these reamers clear chips better than straight flutes, they leave holes with a smoother finish. They're better for holes with breaks in the surface, such as a keyway, because they cut continuously across the breaks instead of moving in and out.

Hardened Steel—Typically more economical but less durable than high-speed steel, these are for general purpose reaming.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.