As a guide, our Square Drive screws use the following driver bit sizes, except as noted within the price list. (In special cases a non-standard recess is used. For instance, #7 and #8 trim head screws normally have a #1 recess in order to avoid breakage problems with the undersized head).
Finally, there are really only two sizes of driver bits in common usage: #1 and #2 Square. They will fit 90% of the screws you are likely to use – screw sizes #6, 8 and 10. Other bits fit screws designed for rather specialized applications. In fact, the #4 driver bit is such a rare beast that it is virtually manufactured to order. We don’t carry screws to fit the bit, but we do carry the bit!
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