The emergency release is essential for garages without an additional door to get access in the event of a power failure or defect. It can be used with up to 44 mm thick sectional doors With a standard 13 mm metal drill, a hole is drilled in the gate surface and the locking cylinder is inserted. A drawstring connects locking cylinder and unlocking of the drive together For all Marantec garage door drives. For all sectional doors with max. 44 mm wall thickness It ensures maximum safety in an emergency 2 Year Warranty, Weight: 0.1984160358 pounds, Manufacturer: Marantec