BOSCH HSS-AlTiN step drill set 3-piece 4-12/4-20/6-30 2608588069

The HSS-AlTiN stepped drill bit drills holes of various diameters smoothly and burr-free. It is ideal for drilling and enlarging holes. Center-punching is not necessary, as the cross-ground drill point makes drilling easier. The CNC-milled spiral flute optimally removes chips and enables even drilling. Axial and radial relief grinding enable maximum cutting performance and absolutely smooth results. The step drill bit is suitable for thin materials made of non-ferrous metal, stainless steel and plastic as well as sheet steel and plastic sheets. It has a 3-face shank. The drill bit is made of HSS steel and coated with AlTiN (aluminum titanium nitride). This ensures maximum service life when using coolant. The easily recognizable and permanent diameter markings in both spiral flutes are lasered.