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- Material: HSS - Type: Multi-Bit Set - Shank Dia:6.35mm 1/4 Hex Shank - SAE Size:6-32NC (3.5mm),8-32NC( 4.2mm),10-32NC( 5mm),10-24NC ( 5mm),12-24NC( 5.7mm),1/4-20NC( 6.35mm) - Suitable for soft metal tapping, such as aluminum plate, thickness of less than 3--4mm. - Back tapered beyond tap to prevent thread damage from over-drilling. - Complete hole drilling, tapping, deburring and countersinking in one operation with power drill saves labor and time Caution: When you use this drill bits, the material temperature will get very high, please add some water or coolant to avoid the material get smoke when using it. Package included: 6 x SAE Drill Tap Combination Bit Set