Stainless steel can be difficult to drill. The trick is to not let the stainless get too hot or else it can work harden. In this video some 316 grade stainless steel is drilled, which is 3mm thick. Brought to you by https://www.ultimatehandyman.co.uk/how-to/table/metalworking/
Sealey Bit Driver Ratchet Micro 6Mm Stainless Steel – Drill Bits -.
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https://www.youtube.com/watch?v=SKNjIX_P7wc