ITEM NAME:3Pcs Hss Co M35 hree Corners Handle 4-12 / 4-20 / 4-32Mm Straight Groove Br F7X5 3Pcs Hss Co M35 hree Corners Handle 4-12 / 4-20 / 4-32Mm Straight Groove Br F7X5 Main Function Of The Product: cobalt step drill (HSS Co) is a high hardness step drill bit that is mainly applied for drilling high hardness steel, such as, the stainless steel plane and hardened steel. The step drill bit can be utilized to drill holes in the stainless steel plane. 1. You can use the hand drill and bench drill to drill holes in the stainless steel plane. Use the hand drill for the board whose thickness is within 1 mm/0.04 in, while use the bench drill for the boards whose thickness is about 2-3 mm/0.08-0.12 in; 2. The drilling sped can't be too fast on the stainless steel plate. Hundreds rpm is enough. 3. Please add the water or cutting fluid to cool down during the processing so as to extend the service life of the drill bits. Shank: 4-32: 10 mm/0.39 in (triangular cylinder shank ) 4-20: 8 mm/0.31 inch (triangular cylinder shank) 4-12: 6 mm/0.24 inch (triangular cylinder shank) Size:4-12 mm (4mm, 6mm, 8mm, 10mm, 12mm/0.16inch, 0.24inch, 0.31inch, 0.39inch, 0.47inch ) 5 Steps 4-20 mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm/0.16inch, 0.24inch, 0.31inch, 0.39inch, 0.47inch, 0.55inch, 0.63inch, 0.71inch, 0.79inch) 9 Steps 4-32 mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm/0.16inch, 0.24inch, 0.31inch, 0.39inch, 0.47inch, 0.55inch, 0.63inch, 0.71inch, 0.79inch, 0.87inch, 0.94inch, 1.02inch,1.10inch,1.18inch,1.26inch ) 15 Steps Color: rose gold Material: high speed steel containing cobalt Package Content: 3* open reamer
