4-20 mm step drill bit for precise drilling without deformation of your bodywork

Drilling the sheet metal of your van is often a stressful step: risk of slipping on the paintwork, deformation of thin metal or irregular holes. This step drill bit is the ideal solution for your conversion work, enabling you to cleanly pierce steel, aluminium, wood or plastic in a single operation.

Its 118° point and conical shape guarantee precise starting without pre-drilling or prior marking, thus avoiding accidental scratches on your bodywork. Made from HSS 4241 high-speed steel with a titanium nitride coating, this professional tool offers increased durability and resistance to overheating thanks to its two straight cutting flutes which effectively dissipate heat.

In addition to creating perfectly round holes, it ensures automatic deburring and edge smoothing during drilling, thus saving you a long and tedious manual treatment. It's the essential accessory for cleanly installing your cable entries, ventilation or interior fixings. For millimetre precision when drilling, you can combine it with an adjustable drilling guide.

Technical specifications of the 4-20 mm professional HSS steel step drill bit

• Bit type: Progressive and stepped
• Number of steps: 9 increments (4, 6, 8, 10, 12, 14, 16, 18, 20 mm)
• Body material: HSS 4241 high-speed hardened steel
• Coating: Titanium nitride for 4 times increased durability
• Maximum material thickness: 4 mm
• Drive: HEX 1/4" for quick and reliable seating in drills
• Point angle: 118° (requires no marking)
• Compliance: Manufactured according to DIN 1412C standard
• Compatible surfaces: Steel, non-ferrous metals (copper, brass, aluminium), stainless steel, plastics and wood