almost certainly by far the most commonplace are Nos. one and 2, Despite the fact that No. 0 are going to be needed for a few really tiny screws and three and four for large screws. (See the Point / Bit dimension manual https://faycjfy816940.thechapblog.com/29184367/how-much-you-need-to-expect-you-ll-pay-for-a-good-types-of-screw-heads