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Bi-fold Door Locks:

Most standard two panel bi-folds use flush bolts to secure them with most standard three panel bi-folds having the same plus a standard lever handle lock setup to secure the third panel or a lever handle which operates a twin bolt locking system.
There are also instead of flush bolts Twin Bolt options with locking and none locking options that have a central flat handle that when turned operate the top and bottom bolts via rods running inside the extrusion.
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