The Honeywell 944T-WH is a white, recessed door/window contact with a 3/8" diameter.The staggered "T" terminal design allows for a secure electrical connection and easy screw-in installation that eliminates the need for splicing or soldering. This wired contact works with Form A SPST (normally closed contact) wiring.The 944T-WH is to be installed within the door or window frame, as opposed to a surface mounted contact. When installing, a 1.5" hole should be made to accommodate the recessed contact. Also known as -Honeywell Ademco 944T-WH 3/8" Magnetic Contact w/ Screw Terminals, White