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I have opened Φ 20 already in 50 holes or more in steel material drilling (t 6 mm), but there is no problem at all. It is the first purchase with DIY. A commercially available drilling machine, cutting oil is cheap oil spray of Homusen. But one to four will be lost with 4 to 5 holes .... I bought two, but it may be good with one. I think that it is recommended privately.