Manufactured in a factory approved to both ISO & automotive TS16949 standards, our Ferrotek range of drill screws have been designed for optimum performance. Made from quality hardened steel, the drilling tip is of a special design for quick starting & fast drilling. Our high performance Ferroseal TM coating is an advanced finish, developed in the US for the rigors of the automotive industry. 1000hr Ferroseal coating. The coating is a 15-20 micron three part process combining a zinc & aluminium rich system to produce a durable protective finish with self lubricating properties thus reducing heat & drive torque. For use with Sheet to steel rails & purlins