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Top-class results: The HSS step drill bit drills smooth, burr-free holes with diameters of 4 - 20 mm Saves time: No need for a centre punch as the tip of the drill bit makes it easier to start drilling Clever design: The CNC-milled spiral flute removes swarf to optimum effect and enables low-vibration and therefore consistent drilling The HSS step drill bit is suitable for thin material made from non-ferrous metal, stainless steel and plastic, as well as sheet steel and plastic panels The drill bit is suitable for drilling through holes and centring holes, Manufacturer: Bosch