Defender Security U 9907 Chain Door Guard ? Door Chain Lock for Door and Home Product Description Secure your home or office doors with additional security with the U 9907 Chain Door Guard. This door chain lock is a security locking device for doors, allowing a door to be slightly opened to allow safe viewing and ventilation. It can also be placed out of reach of children, high on a door, so they cannot open the door themselves and enter or exit into dangerous areas. This chain door guard is constructed of extruded brass with a solid brass finish and a 6?, 8-link welded steel chain. It?s strong and durable, sure to last, and installation is quick and easy. All installation fasteners are included, and it can be used on a variety of door types and can be placed over or beside door casing. When this chain door guard is fully assembled, and engaged from base to keeper, the chain will extend to 4-5/8?. To determine the maximum distance the chain door guard secures a door for safe viewing or ventilation, subtract the thickness of the door from 4-5/8? (approx. 3?). The smaller chain-holder base measures ? wide, and the wider chain lock keeper measures 3-5/16? long; both with a height of 2?. From the Manufacturer This door guard is constructed from solid brass. It features a hardened steel chain that secures your door while allowing viewing and ventilation. Comes complete with fasteners for a quick and easy installation. Features SECURITY LOCKING DEVICE ? This U 9907 Chain Door Guard is a security locking device for doors, allowing a door to be slightly opened to allow safe viewing and ventilation. CHILD-SAFE SECURITY DEVICE ? This door chain lock can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security. EASY INSTALLATION - Installation is quick and easy ? additional security for your home or office doors are within reach! Installation fasteners are included. DURABLE CONSTRUCTION ? This chain door guard is constructed of extruded brass with a solid brass finish and a 6?, 8-link welded steel chain. It?s strong and durable and sure to last. PRODUCT INFO ? The 3-5/16? U 9907 Chain Door Guard can be used on a variety of door types and can be placed over or beside door casing. It features a 6-inch long, 8-link welded steel chain and all installation fasteners necessary for complete install. For all dimensional information please refer to the line art and compare to your needs before purchasing USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.