I normally use Dormer and Presto and was drilling out wheel studs using them, for a laugh I thought I'd try the Lidl gold coloured drill bit .. It went through the stud like it was butter... Went back for more but they was all soldI use dorma too but I brought a set from lidl a while back and they were great too so I went back and brought another couple of sets 0.5mm up to 10mm in .5mm inciments