NDS models provide a hook lock and a deadlocking feature for sliding glass doors. The latch is designed to hold the locking device so that it cannot be lifted out of place. This lock is ideal for replacing the old "AGE" lock or similar type locks. Most popular usage is for sliding doors that need outside keys, such as town homes, mobile homes, camper shells or tops and even swinging doors, or screen doors. It is suggested that the strike be installed first and then mark the lock holes to be drilled after the strike has been installed. The strike can be mounted two ways. Key Blanks (Uncut keys): Older Models used: kb4. Newer Models use: FG403KB. All locks are now supplied with the new style key blank, and two hole mounting.