6pcs HSS 1/4" Hex Shank SAE Drill Tap Combination Bit Set Deburr Countersink Bit Product Feature: High-Speed Steel Material: made of high-quality HSS, durable. Suitable for drilling and tapping in aluminum, brass, copper, plastic, wood, steel, etc. Three-In-One Function: Single drilling, the point is automatically centered, no center drilling or center punching is needed, which can save your labor and precious time. Hexagonal Shank: This drill has a hexagonal shank, easy to identify, each is a combination of twist drill, tap bit, and drill bit. Wide Spiral Groove: The tap bit set also has a wide spiral groove, which allows chips to easily escape from the hole, preventing crowding of chips and breakage of the tap bit. Applicable Scenarios: Good alignment and fast cycle time, which makes it a highly productive tool, suitable for drilling and tapping in aluminum, brass, copper, plastic, wood, steel, etc. Product Specification： Type：Combination Drill Tap Material：High Speed Steel Color: Silver Quantity: 6Pcs Package Included: 1x 6-32NC Combination Drill Tap 1x 8-32NC Combination Drill Tap 1x 10-32NC Combination Drill Tap 1x 12-24NC Combination Drill Tap 1x 10-24NC Combination Drill Tap 1x 1/4-20NC Combination Drill Tap