Commercial and Residential Use For door minimum thickness 44mm Cast aluminum body shell None of parts exposed when door is closed Non handed Size 2,3 is selectable. Needle bearing for smooth operation. Rack and pinion operation. Closing and Latching is controlled by two independent regulating Valves Slide track mounting.( Hold Open is optional) Finishes: Silver, Bronze, Gold. Ideal for hotel guest rooms and Executive offices. 5 years limited warranty. Manufactured by ISO 9001 qualified factory.