The BS3621 Kitemark is a requirement for Insurance Locks and the minimum recommendation from insurance companies. Here you will find our range from leading manufacturers Chubb Locks, Union Locks, Yale Locks and Era Locks. BS3621 is awarded to a lever lock with 5 levers or more, and also to some cylinder locks with equivalent levels of security. As standard, these locks are supplied keyed separately (To Differ) but Keyed Alike options are available so your external doors are all on the same key - contact us if you are interested in this option.