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