SEC-SM-4201-LQ Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: SEC-SM-4201-LQ MANUFACTURER: Seco-Larm Product Details Track-Mount N.C Overhead Magnetic Door Contact. Rugged aluminum housing with 36" leads enclosed in armored cable. 3" Gap. Product Details Back Product DetailsTrack-Mount N.C Overhead Magnetic Door Contact. Rugged aluminum housing with 36" leads enclosed in armored cable. 3" Gap.