About this item Perfect Match: Contains SAE 6-32nc, 8-32nc, 10-24nc, 10-32nc, 12-24nc, 1/4-20nc; Metric M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1, M8 x 1.25, M10 x 1.5; 1 x quick change adapter to maximize efficiency and make it easy to choose the right size Unique Design: Our titanium combination drill and tap bits set adopts self-centering design, no need for auxiliary center drilling or center punching. The fluted pattern helps remove chips and debris from the drill bit, reducing friction and heat, resulting in a faster, cooler drilling process that is easier for you to use High-Quality Material: The bit tool is made of high-quality high-speed steel, with good wear resistance and strong cutting ability. Titanium coating on the combination drill tap bit surface provides longer bit life to the product by resisting heat build-up Easy to Use: Our spiral flute tapping tool set are equipped with special storage boxes, which are convenient for you to store, and each drill is marked with the size, which is convenient for you to find the size you need Wide Range of Applications: Our spiral flute tapping tool set are suitable for drilling, tapping, deburring wood, plastic, iron, aluminum, copper, soft metals and other materials, and the 1/4 inch hex shank is suitable for most power tools , such as, electric drills, bench drills, drilling presses and tapping machines, etc.