almost certainly one of the most prevalent are Nos. 1 and a pair of, Though No. 0 will likely be necessary for some pretty small screws and 3 and 4 for large screws. (See the Point / little bit dimension manual for https://donnankex908901.blogsuperapp.com/30206139/the-fact-about-types-of-screw-heads-that-no-one-is-suggesting