The GRI 410-G is a 4" commercial and industrial surface mount switch set featuring a closed loop design with a standard 1-1/2" gap. It includes a surface mount magnetic contact and offers both concealed terminals (400 model) and side terminals (410 model) for versatile installation. The 410P version comes with a 36", 2-conductor vinyl-jacketed cable. This product includes covers and mounting hardware for convenience. Built-in end-of-line resistors and diodes are available on request, along with private labeling options. It also meets the UL 10C fire rating for enhanced safety. Enhance your security setup with this reliable switch set today!