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  Tec-Spiral Step Drill Bits were made by CBN auto grinding machines and named for the stability and great cutting performance. With the special designs of flute space, the long and curl cutting chips can be removed easily. They are mainly used to work on the hole drilling jobs for the steel plate thickness within 5mm. Several diameters of drill bits can be replaced by one single step drill that can drill and enlarge holes with one time job and great portability. Products can be the great solution for the automotive and aerospace industry on drilling thin plate sheet and provides a good convenient experience for users.