Prevent the accidental locking of the inactive leaf of paired hollow metal doors by any unauthorized person with the 1870HM flush bolt. This flushbolt is a cylinder operated and is ideal for properties with metal doors that require greater security and key control. Unlike conventional flip-lever operated flushbolts, the 1870HM is designed for better use and flexible when installing at a certain threshold or header. At JMAC, we have the right options for your security needs. Dial 516-812-0917 to get started.