* and high quality<br />*manufacturedhss 4241 'high speed steel'.<br />*5% cobalt for higher heat and abrasion resistance.<br />*for use with metal， plastic and wood.<br />*flute diameter ranges1mm - 8mm.<br />*drill bit type: twist drill<br />*shank type: straight shank<br />*manufacturedhss<br /><br />flute diametersize for your choice:<br />1.┵ 1.0mm     2.┵ 1.5mm    3.┵ 2.0mm   4.┵ 2.5mm     5.┵ 3.0mm    6.┵ 3.2mm<br />7.┵ 3.5mm     8.┵ 4.0mm    9.┵ 4.2mm  10.┵ 4.5mm  11.┵ 4.8mm  12.┵ 5.0mm<br />13.┵ 5.5mm 14.┵ 6.0mm  15.┵ 6.5mm  16.┵ 7.0mm  17.┵ 7.5mm  19.┵ 8.0mm<br /><br />package included:<br />10 x drill bits