The shank diameter is slightly smaller than the reamer diameter.

Titanium nitride (TiN) coated reamers run faster than uncoated reamers and last twice as long. The coating acts as a barrier against high temperatures and abrasion.

Straight-flute reamers are for general purpose cutting.

Spiral-flute reamers have a right-hand spiral and a right-hand cut. They pull chips upward as they cut, so they’re often used in blind holes. Spiral flutes create a smoother finish than straight flutes and work well in keyways and other applications with an interrupted cut.

Solid carbide provides exceptional wear resistance and high accuracy in addition to excellent abrasion and heat resistance when cutting hard and abrasive materials. These reamers require rigid tool holding to prevent breakage and are not for use with hand-held tools.