Check the listing for details. Amseco AMS-37 Industrial grade Alarm Magnetic Contacts & Magnets (NOS). Condition: New. Listed at 39.95 USD. Amseco AMS-37 Industrial grade Alarm Magnetic Contacts & Magnets (NOS) (1 Pack / 5-sets)The AMS-37 Industrial 4" Grey Magnetic Contact is a UL Listed magnetic contact built for practically any opening. It is designed to provide clean and quick installations. Can be used to protect openings such as: Trap doors, Man doors, Overhead doors, Roof hatches and hinged skylights. Rugged design for industrial use2" operating gapAlnico 5 magnet Note: Packaging is factory sealed. Listed Parts are (NOS) New & Unused. Original packaging may show imperfections, fading, cosmetic wear and tear. The pictures are up to date and accurate. Please check the full description and photos to insure you are ordering the correct item(s) before purchasing. Please message the Seller directly at any time for the best support, do not rush to contact eBay. If you are satisfied with your order, please leave positive feedback. Thank you! What is NOS?New Old Stock (NOS), or old stock for short, refers to aged stock of merchandise that was never sold to a customer and still new in original packaging. Such merchandise may not be manufactured anymore, and the new old stock may represent the only current source of a particular item.