The function of the latch is to prevent the door from being opened and has a certain anti-theft capability. The latch can also be divided into two types: exposed latch and concealed latch. The most obvious difference between the two types of bolts is the size. Before purchasing, you must first measure the size of your own doors and windows. The materials of flush bolt door hardware are made of aluminum alloy, zinc alloy, stainless steel, and so on.