Material: high speed steel. Ground Straight Tap Set with Step and 1/4" Hex Drive, HSS for M3, M4, M5, M6, M8, M10 for high requirements on process reliability and tool life. High hardness, quick exchange of composite membrane, uses the edged drilling principle. Drilling and tapping in one processing, one-step Solid processing steps and time saving improve work efficiency. Spiral taper design prevents thread damage due to over-drilling. Same centering point, no need for center drilling or punching. The design allows drilling, tapping, deburring and countersinking in wood, plastic, thin aluminum, copper and other soft metals (5-6mm), not for hard materials (e.g. steel plate). Package Included: 6pcs Tap (M3, M4, M5, M6, M8, M10). Note: When drilling a hole, you need to inject water at the same time to cool the drill. This will help you increase the value of the drill. If you cannot cool the drill bit while drilling holes, the drilling speed should not be too high and you should not drill too often. Name: White Diamond/Titanium Plated Hex Shank Metric Composite Tap Application: Three in one (punching --- tapping --- deburring in one go Material: High speed steel Specifications: M3*0.5, M4*0.7, M5*0.8, M6*1, M8*1.25, M10*1.5 It is suitable for processing soft metals (such as aluminum alloys, zinc alloys, tin alloys), thin boards and plastics with a thickness of less than 5mm. Steel materials are not suitable, easy to break Number of pieces delivered: 6-piece set become very rich