Need to get yourself a step drill: https://www.screwfix.com/p/erbauer-s...E&gclsrc=aw.ds
Or if the material was thicker than 5-8mm, a spade bit: https://www.toolstation.com/flat-woo...SABEgJbDfD_BwE
Will save yourself a lot of time and changing of drill bits
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