Dormer E002 Powdered Metal Spiral Flute Threading Tap, Gold Oxide Finish, Round Shank With Square End, Modified Bottoming Chamfer, M3-0.50 Thread Size Spiral flutes for creating threads in blind holes Spiral flute tap pulls chips back from the tip of the tool and out of the hole to prevent clogging Gold oxide finish reduces grinding stress within the tool Powdered-metal steel for performance approaching that of solid carbide tools, with the toughness and shock-resistance of high-speed steel Available in Metric Coarse (M) or Metric Fine (MF) right-hand thread options for different applications