5 Lever Sashlock Square Forend 64mm. The Latchbolt has the ET reverse function to save undoing the case so it can be reversed in seconds. British Standard BS EN 12209 Rated Lock used as a matter of course by the national house builders. This lock provides a good degree of security and carries a 10 year mechanical guarantee. It has been CE and Certifire tested. suitable for use in all domestic, industrial and commercial environments.