#Stepdrill# ,It is mainly used for drilling thin steel plates within 3mm. One drill bit can be used instead of multiple drill bits to process holes of different diameters as required, and large holes can be processed at one time without changing the drill bit or drilling positioning holes. 

According to the flute shape, it can be divided into straight flute, spiral flute and circular flute.  

According to the number of product edges can be divided into single edge, double edge, three edge, four edge and multi edge step drill .