MUL T LOCK Cylinders for ARROW Double Cylinder Deadbolt (set of 2) Color:605 Bright Brass Mul T Lock’s Anti Ligature Hercular® Deadbolt meets Bottom of lock to Mul T Lock’s Anti Ligature Hercular® Deadbolt meets the unique locking needs found in institutions such as hospitals and health care facilities where its rounded shapes and lack of angles greatly decrease an occupant’s risk of injury or self harm by incidents such as hanging incorporating hierarchy and matrix requirement seven with the same suite some users with limited budgets would like to upgrade existing hardware with MUL T LOCK Patented Interactive Key Control Arrow® "E" Series Double Cylinder Deabolts (thin door)