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Author Message   charlie Rating: N/A Votes: 0 Posted on Friday, March 25, 2005 - 07:01 am:    I think Posi Drives are used where high torque is needed. A Phillips with its tapered flanks will just climb up out of its head. The Posi Drive has vertical flanks and has no tendency to climb out of the screw slots (which also have vertical flanks) when a lot of torque is applied.