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The Cal-Royal AUXSLAFLW4 Wood Door Automatic Flush Bolt is a premium, fire-rated hardware solution designed to secure inactive wood doors in commercial and institutional settings. This set includes a self-latching top bolt and an auxiliary fire latch bottom bolt, offering enhanced safety and compliance with UL10C and UBC 7-2-1997 standards for wood composite core fire doors up to 8 feet in height. Engineered for durability and ease of installation, it features a reversible, non-handed steel construction with stainless steel components, a 3/4" bolt throw, and a 1" x 8-1/2" faceplate. The built-in override function prevents damage from misalignment, while the thermal lock ensures automatic engagement during fire conditions. Ideal for standard ANSI door preparations, the AUXSLAFLW4 delivers reliable performance and is available in a variety of architectural finishes to match any design aesthetic.