Features The combination bit is made of high quality high speed steel, which has strong hardness and good durability. Suitable for drilling, tapping, cutting soft metal, aluminum, iron thin board, plastic board and other materials within 5mm. The inch hex shank makes it easier and safer to seat all power tools, especially quick‑changing chucks for locking. Has a tapered end to prevent excessive tapping.Back taper over faucet to prevent excessive drilling and thread damage. Drilling and tapping can be completed in one operation, which is durable and precipitated, greatly saving processing steps and time cost. 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