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This is a convenient hex shank drill and tap bits that can simultaneously complete hole drilling, tapping, deburring and countersinking. Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. Shank Dia: 1/4 inch Hex Shank(quick change for cordless drill ). Material: High speed steel(HSS 6542) Application: Suitable for drilling, tapping, cutting on steel board and 2mm or less stainless steel. Note ・ Be sure to use safety glasses during operation, and keep your hands or face away from the rotating drill and cutting powder. ・ Please read the instruction manual of the power tool to be used carefully, and follow the warnings and precautions of each manufacturer to ensure safe operation. GUARANTEE Here at Rirui-tool we only care about your satisfaction. We try our best to ensure each product is in perfect condition before you get it, but if something is not up to your satisfaction, please contact us for a full refund or replacement.