likely the most prevalent are Nos. one and a couple of, Whilst No. 0 might be needed for many quite little screws and 3 and 4 for big screws. (See the Point / Bit dimensions information for information about Phillips, https://majaaxye610733.mpeblog.com/53328402/how-much-you-need-to-expect-you-ll-pay-for-a-good-types-of-screw-heads