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Hss Step Drill Bit Set(3PCS)
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Step Drill Bits
① 4-12 : 9단계 4,5,6,7,8,9,10,11,12
② 4-20 : 9단계 4,6,8,10,12,14,16,18,20
③ 4-30 : 14단계 4.6.8.10.12.14.16.18.20.22.24.26.28.30
④ 4-39 : 13단계 4,6,9,12,15,18,21,24,29,30,33,36,39
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