Apex® 1/4'' hex insert drive Torx bits from Cooper Tools. Hex will break before rated ultimate torque of the Torx point is met. Torx fasteners are becoming extremely common in automotive repair and appliance assembly. By design, Torx head screws resist cam-out better than Phillips head or Slotted head screws. Where Phillips heads were designed to cause the driver to cam-out, to prevent over tightening, Torx heads were designed to prevent cam-out. The reason for this was the development of better torque-limiting automatic screwdrivers for use in factories.
Apex Fastener Tools Catalog Page: 10