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Stainless Steel 304 Best Fire Cylinder Lock Body Mortise Front Door Lock. Fire Rated Certification: EN1634 certified for 240 minutes fire resistance. Durable Material: Constructed with Stainless Steel 304 for corrosion resistance. Multiple Backset Options: Available in 45mm, 50mm, and 60mm backsets. High Cycle Test: Passed 200,000 test cycles for long-term reliability. Customizable Finishes: Offers SSS, PSS, PVD, AB, and AC finish options. 5-Year Mechanical Guarantee: Comprehensive 5-year warranty on mechanical parts. Versatile Application: Suitable for wooden, metal, interior, and exterior doors. OEM/ODM Capability: Professional OEM and ODM services for famous brands.