HES KD-OPTION is a faceplate KD (4-7/8" x 1-1/4") for use with Mortise locksets with a deadlatch positioned above the latchbolt.  

All of the 1000 Series options are interchangeable. 
The option kit contains all of the necessary parts to convert the 1006 into the particular model, i.e. 1006 + KD option = 1006KD.

Compatible Locksets: Jackson, Sargent (7700 & 8100), Schlage,
Yale (8700). ANSI/BHMA Numbers: #E09321, #E09322, #E09323.
After releasing the latchbolt the keeper returns to the locked position. (Does not require a relocation of the center line.)