Features: 
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<br />t100% brand new and high quality. 
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<br />tSuitable for drilling, tapping, cutting on soft metal, aluminum plate, iron and etc. 
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<br />tFast replacement composite cone, uses drill edged principle. 
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<br />tDrilling and tapping in one, one-step processing, improve working efficiency. 
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<br />tSelf-centering point, do not need assistant center drilling or center punching. 
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<br />tHand hardness, rustproof, solid and durable. 
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<br />tSpecifications: 
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<br />tItem type: hexagon handle compound tap drill bits 
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<br />tMetric : M3, M4, M5, M6, M8, M10 
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<br />tMaterial: High-speed steel(HSS ) 
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<br />tSuitable for soft metal, aluminum, iron 
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<br />tSize: 
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<br />tM3: Total length: 55mm/2.17 , Spiral length: 24mm/0.94 , drill diameter: 2.5mm/0.10  
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<br />tM4: Total length: 54mm/2.13 , Spiral length: 24mm/0.94 , drill diameter: 3.3mm/0.13  
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<br />tM5: Total length: 58mm/2.28 , Spiral length: 28mm/1.10 , drill diameter: 4.2mm/0.17  
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<br />tM6: Total length: 58mm/2.28 , Spiral length: 28mm/1.10 , drill diameter: 5.0mm/0.20  
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<br />tM8: Total length: 59mm/2.32 , Spiral length: 18mm0.71 , drill diameter: 6.8mm/0.27  
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<br />tM10: Total length: 59mm/2.32 , Spiral length: 20mm/0.79 , drill diameter: 8.5mm/0.33  
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<br />tPackage includes: 6pcs hexagon handle compound tap drill bits