Suitable for all sheet metal work and deburring of metals, non-ferrous metals and plastics. Fits all common drills. The HSS step drill is made of premium HSS steel and coated with titanium to reduce co.ukiction and heat. Top quality product. Material: HSS4241 - High heat resistance - With long service life. Technical characteristics: Dimensions: 10 to 45 mm in 8 levels: 10, 15, 20, 25, 30, 35, 40 or 45 mm. Content: 1 step drill.