MS1880 Two-Point Flushbolts offer greater convenience than flip-lever flushbolts. With one operation, they provide security and reduce human error. Used instead of flip-lever flushbolts in the inactive leaf of paired doors, the MS1880 Two-Point Flushbolts offer greater convenience, one operation instead of two. They also promote security by removing an element of human error. A positive blocking device makes it impossible to turn the key in the active door unless the inactive leaf has first been secured. The MS1880 must be installed in conjunction with a pivoted bolt MS deadlock. Cannot be unlocked when pivoted bolt is in locked position. Not to be used as a standalone locking mechanism. Red background indicator has aluminum letters reading ï¿½LOCKEDï¿½ when secure. No message shown when unlocked. Turn knob or lever 180 degrees clockwise to throw hardened steel bolts into header and threshold and clear strike opening so pivoted MS bolt can enter from active door. Counterclockwise turn retracts vertical bolts and blocks entry of pivoted bolt. Operates in conjunction with any MS pivoting deadlock.