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The Torx screwdriver is much like the Phillips head model only that it uses a six-pointed star shape in its head. These drivers also come in various sizes â from 1 through 100 â with the smallest measuring around 0.031 inches and the largest measuring around 0.871 inches.
I think it was patented in the 1930s. It was invented to provide  an automatic screw-driver function on assembly lines. When the  screw was tightened sufficiently, the bit â¦ would start to slip.  That is, unlike the TORX screw, the Philips-head was not for the  purpose of increasing the torque on screws.