Screwdriver Types: 6 Common Types and How to Use Them
Naturally, 0 is the smallest and 4 is the largest. Though most often you'll come across sizes 1 and 2, which fit most standard size screws (2) and electronics and jewelry (1). Flat head (Slotted) screwdriver types are different, measured by fractions of an inch. So before you begin, just make sure the screwdriver fits the screw head properly.
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