Carbine Sandown Entrance Knob SetCarbine 4000 Series Sandown Entrance Knob Set 60mm 70mm Backset. Function Outside function Opened by knob when free. Key locks or unlocks both knobs but does not retract the latch Inside function Opened by knob at all times, Turnsnib locks outside knob Additional Information Fire rated for 2 hours to Tyco specifications Tiebolt fixing Supplied with 60 70mm adjustable latch in both boxed and display pack. 127mm backset is available if required Suitable