Fire Rated Door Matching Layout: Custom shaped to fit hollow metal swing door frames of fire specified construction and conforms to unified industrial structural standards, supporting unobstructed door rotation and delivering tight physical contact between door and frame for consistent structural sealing effect Integrated Solid Metal Framework: Formed with high density solid metal through precise machining into one-piece rigid framework, the compact surface construction reduces surface abrasion generated from continuous repeated opening and closing cycles and maintains uniform operating performance over extended service periods Fully Recessed Internal Mount Layout: Designed for complete inner embed installation within door bodies to eliminate exposed external parts vulnerable to outside physical collision, the built-in limiting structure keeps door panels closely aligned with frames to maintain steady closed positioning Light Touch Hand Operating Mechanism: Optimized hand lever mechanical structure replaces traditional push-pull layouts, internal sliding bolt assembly moves freely under gentle force to simplify repetitive locking and releasing actions during daily frequent use Internal Reinforced Stable Movement System: Extra internal fastening pieces strengthen the whole framework connection, sliding bolt assembly maintains unobstructed back-and-forth travel without stuck jamming to guarantee consistent smooth operation on every use, Manufacturer: Mlyvax