This great combination Drill and Tap bit set is a must have in your tool box. 1.Everything is here; you do not need to look for a drill and a separate tap;  2.Variety of common sizes both metric and standard are included 3.With a 1/4” hex shank quick-change adapter, it is very easy to use. 4.They work great in tracing and adding threads back to holes, and creating threaded holes for installing handles, hinges or wheels in metal plate or sheet metal and more 5.They are made of high-speed steel and coated with titanium alloy for better durability and rust resistance,longer service life. Follow the steps bellow, you will get nice clean threads in steel and aluminum and other materials 1.Go slow, Do Not force them 2.Use plenty of cutting oil and take your time  3.Cut and back out a little and cut again until it goes completely through 4.Drill a pilot hole that's slightly smaller first on tougher metals 5.Work on 1/4 inch or less thick plate or sheet metal copper, brass, aluminum, plastic and more.  6.Warm Tips: Push too hard, tap bits may snap; try to force, tap bits may snap; use an impact, tap bits may snap; no oil, tap bits may snap… Package including 6-piece of SAE Drill and Tap Bits: 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, ¼-20NC 6-piece of Metric Drill and Tap Bits: M3 x0.5, M4 x 0.7, M5 x 0.8, M6 x 1.25, M8 x 1.25, M10 x 1.5 1-piece of 1/4 inch Hex Shank Quick Change Adapter 1 storing case with swivel bits holder to keep the bits well-organized and easy to access

• 3-IN-1 for Higher Efficiency - Drill and tap bit set combines drilling, tapping and countersinking functions in one bit, with which you can finish 2 or 3 jobs without changing bits
• Versatile Sizes - Ready When You Need to make screw holes, this tap bit set includes 6 pc SAE sizes drill bits 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, ¼-20NC and 6 pcs Metric sizes drill bits M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5
• Built for Metal Work – these Tap Bits made of high-speed steel and coated Titanium Alloy, will work with a wide variety of materials, such as 1/4 inch or less thick plate or sheet-metal, copper, brass, aluminum, plastic and more
• Convenience exceeding expectation - This drill bit set come with a 1/4” hex shank quick-change adapter for easy use and extending working depth, and a well-organized storing case for easy access and portable
• User Tips for all Drill and Tap bit set – a. Go slow, Do NOT force them; b. Use a lot of cutting oil; c. Take your time; d. It will work better to cut and back out a little and cut again; e. Drill a pilot hole first on tougher metals B0BF4HN5SZ