Alloy Hole Saw Drill Bit 12-120mm Bi Metal Cutter Bits. 12mm, 13mm, 14mm, 15mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm. 20mm, 20.5mm, 21mm, 22mm, 22.5mm, 23mm, 24mm, 25mm, 25.5mm, 26mm, 28mm, 30mm. 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, 53mm, 55mm, 60mm, 65mm, 70mm. 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 110mm, 120mm. Shank Shape : Hex Shank. The cutting edge adopts a three-layer combination design of outer cutting edge, middle cutting edge and inner cutting edge. It is cut by layered components, cutting resistance is small, and chip removal is smoother: it is not easy to produce chipping and effectively extend the service life. High-strength, strong and tough cemented carbide, even in harsh environments, can maintain good chipping resistance and wear resistance. As well as light machinability, and thus more durable! Combining metal cutting principle with unique super-hard alloy cutting edge performance and high quality, adopting the front and rear inclination. Of the tooth profile + three-knife combination main design, it is more suitable for thick plate drilling, making it more efficient than flat tooth drilling. It is easy to install and use. It can be drilled with electric drill, magnetic drill, bench drill and radial drill. Use For : Steel plate, iron plate, aluminum alloy, iron sheet, stainless steel. Applicable tools: Hand drill, magnetic drill, bench drill. Package include: According to your choose. Choose your need from above drop down menu. (Except some countries and APO/FPO). Service transit time is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday. We care about our valued buyers, if you have any questions, our customer service staffs will be very glad to help you. We try our best to reply to your emails as soon as possible, however, due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately.