Crazy, what is forend plate in door locks???
Forend plate is plate (usually in metal material) that fixed in the place of latch and bolt of a lock case, which is a necessary part for installation.
The function of forend is to protect the door frame from wear. When install the locks, all the lock will install a forend, and it’s all included in the standard package, without the forend, if the doorframe is worn then it will looks ugly, and sometimes the door will be broken.
Usually when buying the room door lock, entrance door lock, or bathroom door locks, the information of unlock ways, forend plate sizes, with or without up and bottom hook, etc. will be provided to the user. But because of the user doesn’t really know the importance of forend size, and give wrong size to the seller, that’s why wrong forend plate happened. Of course sometimes is because of the seller too careless.