Constructed to provide security to pairs of aluminum stile doors, the Adams Rite 4016-20-01 Header Bolt adds maximum security features with the turn of a key. By extending its stainless steel hexbolts and pivoting the MS bolt into the mating stile simultaneously, this three-point lock secures the doorway. It operates on a 360 degree key turn, and the key can only be removed if the lock is in a positively locked or unlocked position. It is designed for 7' high doors, and is not applicable to 7/8" backset locks. It also has a hexagonal 3/8" flat to flat header bolt, and is constructed out of stainless steel for added durability and protection.