2608597519 HSS Step Drill Bit 4mm x 20mm. A professional range of HSS Step Drill Bits from Bosch. Designed for use on virtually all thin materials such as non-ferrous metals, sheet steel, plastic or stainless steel.
This range of Step Drill Bits provide burr-free drilling without the need of pre-drilling. Also the spiral flute extends the Drill Bit lifetime and offers less vibration and a faster drilling rate.
Ideal for deburring and can drill or enlarge round holes of different diameter with a single Drill Bit.