1. Combination Drill and Tap Bit: Thread Sizes: (SAE) 632NC, 832NC, 1024NC, 1032NC, 1224NC, 1/420NC; (Metric) M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.0, 0.25 mm, 10 x 1.5. Can handle both through holes and blind holes. The tap set includes a quickchange adapter for easy bit swapping, and the sturdy plastic case is lightweight and durable for easy storage and organization. 2. 3in1 CombinationThe 3in1 combination drill and tap set can complete drilling, tapping, and countersinking. Three processes in one, singlestep operation, saves machining steps, improves work efficiency, and delivers precise machining results. 3. Special Design: Selfcentering point, no need for auxiliary drilling or punching. Quickchange hex shank (6.35 mm / 1/4 inch) allows easier and safer use with power tools. A tapered end on the hex shank prevents overtapping. It exceeds the tap to prevent overdrilling the thread. 4. 4341 Speed SteelHSS4341 taps provide standard hardness, wear resistance, and heat resistance for general threading applications, suitable for tapping softer materials or standard machining operations. Titanium coating offers corrosion resistance and reduces friction coefficient for smoother threading.