Euro Profile BS Cylinder Doube Sashlock - Complete Set. BS Sashlock 64mm and 76mm versions.. The Latchbolt has the Easi-T reverse function to save undoing the case so it can be reversed in seconds British Standard BS8621 Rated Sashlock used as a matter of course by the national house builders. This lock provides a high degree of security and carries a 25 year mechanical guarantee. It has been CE and Certifire tested. Suitable for use in all domestic, industrial and commercial environments.