*Material: 4341 High Speed Steel,Made of High Speed Steel (HSS), high hardness and rust resistance for long life.*Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. 6 sizes set, which perfectly meet your different needs. A sharp, the drill bit induction hardened, resistant to slightly induced wear, to ensure the puncture speed, improve work efficiency.*Complete drilling, tapping, deburring and countersinking in one operation, save processing steps and time costs, improve working efficiency.* 6 steel drill bits, suitable for drilling wood, plastic, thin copper, aluminum and other soft metals (5-6 mm), not for hard materials (eg sheet metal). 'steel).*When drilling a hole, you need to inject water at the same time to cool the bit. This will help you increase the value of the exercises. If you cannot cool the bit when drilling holes, the drilling speed should not not be too high and you should not drill too frequently.Features: drilling, tapping and deburring / countersinking. Suitable for metal, aluminum tapping The advantage is opening, tapping, chamfering. You can save steps processing and time costs, improve efficiency Tapered back past tap to prevent thread damage from over-drilling. The Its spiral groove, inside the transformation thread, cut out to exclude, and was threaded applied inside the threaded through holes Specification: Color: Silver Bevel Angle: 90 Shank: 1/4'(6.35mm) hex shank Material: 4341 High Speed Steel Surface Treatment: Titanium Coated Size: M3x0.5: Total length: 54mm M4x0.7: Total length: 55mm M5x0.8: Total length: 56mm M6x1.0: Length total: 57mm M8x1.25: Total length: 59mm M10x1.5: Total length: 60mm Note: *Please add oil before operating the valve, so that the operation is smoother, and also to prolong tap life. *Application: 4241 high speed steel is suitable for wood, aluminum, aluminum and other lower hardness materials, material thickness is 3-5mm. Package included: 6pcs Hex Shank Tap Drill Bits drilling