Use this heavy-duty magnetic Garage Door Contact Switch on garage doors roll-up doors and other doors or gates where it may be difficult to mount regular magnetic contacts. Smaller magnetic switches have a small operating gap where the contact and magnet must be within half an inch for reliable operation. While those switches are fine for most doors and windows in a home they just won t cut it for larger doors. These contacts can be as far as 2 3/4 inches apart and still operate. Switch contained in low-profile cast aluminum housing anchored directly to the floor and curved so heavy vehicles can cross over without damaging it. - Magnet in gray ABS plastic case mounted on L shaped bracket - 24 (61cm) wire leads enclosed in stainless steel cable - Switch size: 4-3/8 x1-3/4 x7/16 (111x44x11 mm) - N.O. contact for N.C. circuits Gap: 2-3/4 (70mm) Mfr. # SM-226LQ 82-13885 UPC: 018227480215 Search_Phrases: garage alarm sensor alarm sensor garage sensor door floor sensor alarm door sensor