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.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.