Key-Thumbturn cylinder lock suitable for MULTIPOINT LOCKING SYSTEM door. Key is need to open the lock both inside and outside.
Measurement A - Measure from one end of the cylinder to the middle of the central screw hole (e.g. 40mm). Measurement B - Measure from the other end to the middle of the central screw hole (e.g. 45mm). This would be a 40/45 cylinder (85mm in length). No further measurements are required. Please note if it has a key one side and turn on other side, note the side the thumb turn is on example 40/30T