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The Cal-Royal AUXAUTOFLM1 Metal Door Automatic Flush Bolt is a UL Listed, fire-rated top bolt designed specifically for metal doors up to 8 feet in height, offering superior safety and compliance with UL10C and UBC 7-2-1997 standards. Engineered for durability and ease of use, this flush bolt features a reversible, non-handed design, a steel body with stainless steel components, and a thermal lock that automatically secures the inactive door during fire conditions. Its smooth cam and piston mechanism requires only 5 lbs of force to operate, meeting ADA requirements, while the override feature prevents damage from misalignment. With a 3/4" bolt throw and vertical adjustment, the AUXAUTOFLM1 ensures reliable performance and easy installation in standard ANSI door preparations, making it an ideal choice for commercial and institutional metal door applications.