4 Pcs Step Drill Bit Sets,Cone Drill Bit Set,Hex Shank Metric Quick Change with Impact Driver for DIY Woodworking,Metal,Plastic(3-12/4-20/4-12mm)

• Material:Step Cone Drill Bits is made of high speed steel,and the Titanium Nitride Coated to reduce friction heat,and run cooler.
• Packing:Includes 3 sizes,3-12mm,4-12mm and 4-20mm,and comes with a portable cloth bag for easy storage and organization without worrying about falling.
• Design:The drill tip adopts a 135°bifurcated tip design,which not only increases the cutting speed,but also prevents the step drill bit from slipping during operation.The cutting becomes faster,effectively saving your time and energy.
• Use:One step drill bit can punch holes of different sizes and the material is hard,to meet your various needs at work.
• Application:It is suitable for DIY production,woodwork,workshop processing and other purposes.Can be used for punching iron and wood within 3mm.Step drill bit can be used with electric hand drill.

4 Pcs Step Drill Bit Sets,Cone Drill Bit Set,Hex Shank Metric Quick Change with Impact Driver for DIY Woodworking,Metal,Plastic(3-12/4-20/4-12mm)