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ø4.2mm HSS turbo point drill bit. Application: The turbo point drill is designed for professional individuals who desire an. aggressivecut in metals. The drill is designed with a standard 118°. point, but shaped with a self-centering turbo point for cleaner entry and fast. starts. The drill bit is manufactured from HSS (hi-speed steel) and can. be used to drill materials such as iron, steel, non-ferrous metals and plastics. The shank is designed to have three flattened sides to ensure. better grip in a 3 jaw chuck. TIP: When drilling hard metals, always use a coolant/lubricant. We recommend using. CT-90. APPOXIMATE DRILLING SPEEDS IN METAL: DIAMETER. RPM. 1.0 -2.0mm. 3500. 2.5 - 3.5mm. 2500 - 2000. 4.0 - 5.0mm. 1700 - 1400. 5.5 - 6.0mm. 1400 - 1100. 6.5 - 8.0mm. 1000 - 850. 8.5 - 13.0mm. 800 - 500.
