in all probability probably the most common are Nos. one and 2, Despite the fact that No. 0 will be required for some very small screws and 3 and four for large screws. (See The purpose / little bit dimensions Guide for https://tiffanykber333049.blogzag.com/73987093/the-fact-about-types-of-screw-heads-that-no-one-is-suggesting