![]() The Phillips screwdriver has become the standard in many different countries. Robertson drives have corresponding color codes to make each size easy to identify. Like the Phillips screwdrivers, Robertson drives also make use of a numbering system. The Robertson drive is commonly referred to as a square drive and is very popular in both electrical and construction fields. Measurements for the sizes of hex keys are done across the flat parts of the hex. These hex keys are sometimes referred to as Allen wrenches and these screwdrivers usually come in an L-shaped key with no handle. These screwdrivers are the easiest to recognize because of its wedge-shaped end. ![]() Flat Head Screwdriver SizesĪ flat head screwdriver is also sometimes referred to as a slotted screwdriver. But how do you know when you have all the necessary sizes?īelow you will find the 5 most common screw head shapes with the various sizes available. Getting a set that has the sizes you need most can often be more important than buying a “full set” that lacks one or two vital sizes. Have you ever looked at a screwdriver setand thought “There are more sizes than I’ll ever need” only to read reviews and find out they’re incomplete? It is thus better to buy the sizes that you need most rather than to buy a full set that you later find is incomplete. A full screwdriver set might seem like it has far more sizes than you will ever need, but then there comes a day where you realize that your screwdriver set is missing a size that you desperately need.
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