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This is an improvement on the popular Hex Socket Head Cap Screw. Instead of an Allen drive, the Hexalobular (6-Lobe) drive or Torx eliminates the few shortcomings of the allen drive.

Socket caps have a small cylindrical head with tall vertical sides. Allen (hex socket) drive is a six-sided recess [Internal Hex Socket] for use with an Allen wrench (hex key). This design is the workhorse of the machine building industry.