The 855 series features Key Wind operation which allows the door to be locked and unlocked by 2 turns of the key. The latch is retracted by the key or the handle. Type 3 refers to 2 roller, 2 hook locks.
Operation: Key wind.
Latch reversal: Undo the screw in the side of the lock case adjacent to the latch. Remove the latch, reverse, reinsert and repace the screw.
Case height: 212mm
Case depth: Backset + 18mm
Overall length: 2170
Distance between inner hooks: 1491mm
Distance between middle rollers: 700mm
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