1 in. long magnet?? it is ideal for casement windows?? sliding windows and thin frame applications</br>More powerful Alnico 8 magnet for up to 7/16 in. (11mm) gap</br>1 foot zip cord leads are standard</br>Monitors the opening and closure of doors and windows</br>Can be added to a wireless home security system with video surveillance cameras and more</br></br>Product Description</br></br>With a 7/8"ong magnet?? the 951WG is ideal for casement windows?? sliding windows?? and other thin frame applications.</br><br/>http://www.amazon.com/gp/product/B001UKY1A4ee