Recommended for residential and business use, it’s available as a single- or double-cylinder or with a unique “captive thumbturn.” The captive thumbturn converts the inside cylinder to a thumbturn for safe exit when the facility is occupied. A quick conversion when the facility is not occupied returns it to double cylinder mode and guards against unauthorized entry or exit. Maxum®deadbolts offer maximum protection with solid-brass construction, along with anti-drilling and anti-prying features.