Borg heavy duty marine quality mechanical digital lock. Lever handle operation with clutch. Easi-code pro code change by special key (no need to remove from the door). With 60mm backset (84mm deep) anti-thrust tubular mortice latch - can also use a DIN standard 8mm spindle nightlatch or sashlock (with a Scandinavian Modular version. Use recommended intumescent on mortice latches for fire doors. Passage mode function. Over 1000 combinations (not sequential). Stainless steel coding mech. Reversible. Marine grade black.