HENA HSS Step drills are made from different kinds of high speed steels.
We have 4241 HSS, 4341 HSS for DIY use and M2 & M35 for professional use. The step drills can be milled or fully grounded. Surely, different designs are also available, such as straight flute, Spiral flute, Tri-flute, etc., going with cylindrical shank, 3 Flat shank or Quick change hex shank. The surface treatment can be polished, Tin coat, amber coat, TiAIN coat, etc..
Special sizes or types are available upon the receipt of customers’ requirements.