What do people recommend? Do those cone drills work on trim? I'm installing some USB points in each B-Pillar plastic trim. I went to my hole cutting set and found exactly the one in need is fubar. I cannot even recall doing it, plus its the only one thats ever been used. Cheap set in plastic box. Prob £5.99. Bought so long ago, I can't remember. Anyway, since I have to purchase another to cut an 29-30mm (ish) hole I thought I'd enquire. May as well buy a half decent one.