Contract Din Latch, 55mm. Square or Radius option. The Latch bolt has the Easi-T reverse function to save undoing the case so it can be reversed in seconds. Certified to BS EN 12209. Used as a matter of course by the national house builders. This lock carries a 5 year mechanical guarantee. It has been CE and Certifire tested. Suitable for use in all domestic, industrial and commercial environments.