Rollerbolt latches are commonly used on doors where you wish to fit a cupboard knob or a pull handle. The roller slots into the striker plate in the door frame to keep the door in the closed position, the spring can be adjusted for varying the force needed to open and close the door.
A roller latch is a type of door latching mechanism to keep a door closed. The 2012 edition of the LSC requires corridor doors to be provided with a means for keeping the door closed that is acceptable to the authority having jurisdiction.
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