Dorex TL82 B C32D Medium-Duty Double Storeroom Institution Knob – Stainless SteelTL82 B C32D Double storeroom institution function suitable for partition walls and institutional applications Cylinders on both sides always locked momentarily unlocked by turning key Architectural quality for medium duty commercial applications High quality stainless steel finish For 1 3 8 to 1 3 4 door thickness 2 3 4 backset Optional backsets by special order: 2 3 8, 3 3 4, 5 Non handed field reversible Knob diameter is approximately 2 1 8 3