Spacer nut for installing latches in insulated or laminated doors. The nut is used in combination with housing of corresponding length. The nut is supplied in two versions: 

X: The threaded area located at the end of the nut (see drawing). Use on long housings to speed up mounting. Clamps on to front panel only. 

Y: The threaded part located at the open end of the nut (see drawing). Use on thick, insulater or similiar doors. Clamps on to both sides of the double-sided door.