Apex u-Guard covering is made of a Thermo Plastic Urethane (TPU elastomer) which cushions against costly incidental side impacts. It offers the lowest sustained coefficient of friction for maximum tool efficiency. It is also Non-Removable for tamper resistance. The Apex u-Guard provides a protective barrier between genuine Apex Fastener Tools and your finely finished workpiece. The free-spinning design provides maximum protection for polished and highly sensitive surfaces.Apex female square drive Torx service drive bits from Apex Fastener Tools, formally Cooper Tools. 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.With Apex u-Guard you get the proven Apex Fastener tool fit and performance plus the best protection available against marring and in-system damage. u-Guard is your guard against the potential hazards caused by rotational friction. Apex Fastener Tools are made from only tool grade steel then heat treated using our proprietary process for the proper hardness based on the application. Each core tool is then machined for a precision fit that exceeds industry standards.