Yeah a normal holesaw will be fine in that case, make sure it's a sharp one and do the pilot hole first, if you try to do it with the holesaw attached you will almost certainly end up ramming the spinning holesaw down onto the bath when the pilot breaks through and this will split the bath, guaranteed. Measure twice, drill pilot holes, remeasure, double-check pipe centres on the taps if you have a mixer, measure again, then go in carefully with the holesaw
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