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(Or head sizes of 5mm vs 6.4mm if you prefer.)<BR><BR>A typical flathead screw has a head diameter of 0.25", and while that 0.05" difference might not sound like much, it makes all the difference ...
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Why Is It Called a “Phillips Head” Screwdriver? - MSN
Why the Phillips Head Is Superior Phillips was so enthusiastic about his design because the screw could be self-centered. As anyone who has driven in a flathead screw can testify, slotted screws ...
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