• Made from HSS-Co, heat treatment to it, high hardness, high wear resistance, high toughness, high bending strength, sharp edge, the best choice for processing stainless steel, better than ordinary step drill.
• Unique step structure, a drill can punch out a variety diameters of holes.
• Does not need center punch to assist it, compared with ordinary hemp flower drill, it is stabler and difficult to be broken.
• It is suitable for being installed on the pistol drill and bench drill, applicable for punching on these harder workpieces, such as stainless steel, carbon steel, aluminum plate, iron plate, etc.

• Please water it for cooling while punching so that can prolong its lifetime, rotation rate from 250 to 400 is recommended.

• Material: HSS-Co
• Handle type: Hex handle
• Handle diameter: 1/4"(6.35mm)
• Step quantity   Edge length  Handle length     Step diameter

         9steps             50mm          31mm           3/4/5/6/7/8/9/10/12mm

        10steps            50mm          31mm           4/6/8/10/12/14/16/18/20/22 mm

        11steps            57mm          31mm           6/8/10/12/13/14/16/18/20/22/24 mm

        9steps             50mm          31mm           4/5/6/7/8/9/10/11/12mm

• 1pc HSS-Co Cobalt Spiral Groove Step Drill Bit