A slot in the housing requires a special key to operate the lock. One end of the key is removable in both the locked and unlocked positions; the other end—only in the locked position allowing the key to act as a handle when operating the vent. This Vent Lock Handle features a durable, metal finish and Measures 5-1/2" Long by 1-1/8" Wide with a Depth (Thickness) of 1-5/8". Vent Lock Handles sold individually. Lock and Hardware not included.