Drillco machine countersink have a longer shank to use in turret lathes and for screw machine work. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Round shanks allow use with a wide variety of toolholding systems . Right-hand cut tools have a cutting action that engages when they are run in a clockwise direction. Countersink have a longer shank to use in turret lathes and for screw machine work.