![Step drill 10-45 mm](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)
Step drill 10-45 mm suitable for workpieces with a hardness below 25°, such as carbon steel, sheet iron, insulation boards, PVC boards, planks and wood. The plate thickness below 5 mm. Use water cooling when drilling to extend the life of the drill bit. Recommended drilling speed 250-400 rpm. Spiral cutting flute: 135 split point tip and double grooved construction for self-centring and deburring, spiral groove helps remove chips when drilling. Unique step design, a drill can be used to open holes of different sizes, means the equivalent of a box of drills. High-speed steel tools are suitable for most general applications and offer a combination of hardness and toughness for wear resistance.