Product changed in October 2016, same footprint, but no longer compatible with 570 cylinder.

External access device.
Suits the Briton 376E range.
Anti vandal design includes a clutch mechanism which allows the knob to rotate when the unit is locked.
Operates with a (Cisa) 1/2 euro fixed cam cylinder.
Key retaining pin included (optional functionality).
Common footprint allows units to be interchanged.
Suitable for doors 40-70 mm thick.
Satin chrome plate.