About this item HIGH EFFICIENCY : ColumPRO Drill and Tap bit is designed for multi-functional, including drilling holes, making threads, and chamfering holes all at once. Instead of changing and drilling different tools to get the job done, you simply need to put on the drill and tap bit and drill one time. Saving you time and effort in the project. SUPERIOR MATERIAL : ColumPRO Drill and Tap bit set is made of high-speed steel and special titanium blue coating, our spiral tapping bits have superior corrosion resistance and long-term durability. Multi-function drill bits are forged with razor-sharp cutting edge, enlarged spiral flute, 1/4” quick-change hex shank ensure smooth and efficient results when working with. PRATICAL USE These three in one Screw tapping bits can drill, tap, deburr and countersink holes on sheet metal, soft thin metal like copper, brass, aluminum, and plastic, PVC, fiberboard, wood. Suitable for cordless drills, electric screwdrivers, bench drills and other tap machine. Perfect tool set to have for tapping, small repair projects, DIY projects and home maintenance. INSTRUCTION when using these multi-function drill bits, it is best to drill in a vertical angel 90 degree from the object to have a straight thread for screw to fit in. Apply oil when drilling will increase working speed and durability. After threading, put the drill in reverse, carefully pull out the bit straight will prevent damaging the thread. Comprehensive Set This set includes 12 drill&tap bits in varying metric sizes and : M3,M4,M5,M6,M8,M10, 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, ¼-20NC, screw tapping bits included, providing you with a complete package for all your drilling needs. Our drill and tap bits set come with a storage case for easy portability. You can store them directly in your toolbox, allowing you to easily access them wherever you go — no more lose bits or searching for what you need.