Features Steel Material: The combination bit is made of high quality high speed steel, which has strong hardness and good durability. Tapered End: Drill Tap Combination Bit has a tapered end to prevent excessive tapping.Back taper over faucet to prevent excessive drilling and thread damage. Easy to Operate: Drilling and tapping can be completed in one operation, which is durable and precipitated, greatly saving processing steps and time cost. Safety Power Tool: The inch hex shank makes it easier and safer to seat all power tools, especially quick‑changing chucks for locking. Suitable for: Drill Tap Combination Bit Set is suitable for drilling, tapping, cutting soft metal, aluminum, iron thin board, plastic board and other materials within 5mm. Specification:Item Type: Combination Drill Tap Material: High Speed Steel Size: 1/8-40，5/32-32，3/16-24，1/4-20，5/16-18，3/8-16 Purpose: Composite Tapping Kit Color: Dazzling Blue System: Imperial System Working Form: Tapping and Chamfering Integral Package List:6 x Hex Shank Tap Bit Note:Recommended for tapping machine. Pay attention to the operation method when using the electric drill. Package List 6 x Hex Shank Tap Bit