Check the listing for details. GRAINGER APPROVED 2EXT9 Magnetic Contact,Surface Mount,L 9/16 In 2EXT9. Condition: New. Listed at 26.77 USD. Magnetic Contact, Surface Mount, Electrical Configuration Normally Open, Loop Configuration Closed, Material ABS Plastic, Color White, Max Current (Amps) 0.5, Max Voltage 100 VDC/VAC, Gap Distance 2 1/2 Min, 2 3/4 Max In, Length 9/16 In, Height 9/16 In, Width 4 3/8 In, Depth 9/16 In, Operating Temp Range -15 to 160 F, Response Time 0.5ms Max Sec, Mounting Surface, Two #8 Screw Holes, Standards, Includes Hardware, For Use With Windows and Doors Low-current magnetic contacts send a signal to an alarm or a supervised monitoring system when the door magnet moves away from the frame magnet. A gap between the contacts compensates for ill-fitting doors and windows opened for ventilation. Closed-loop configuration is for wiring magnetic contacts to an alarm. Switch is closed when magnets are in pr.