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This is a convenient hex shank tap drill set that can simultaneously complete hole drilling, tapping, deburring and countersinking.<br> Size: 6-32nc 8-32nc 10-32nc 10-24nc 12-24nc 1/4-20nc. <br> Shank Dia:1/4 inch Hex Shank(quick change for cordless drill )<br> Material: High speed steel(HSS 4341)<br> Application:Suitable for drilling, tapping, cutting on light metal, aluminum plate, iron, etc.<br> <b>Note</b> ・ Be sure to use safety glasses during operation, and keep your hands or face away from the rotating drill and cutting powder.<br> ・ 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.