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UL ANSI Grade 2 Fire Rated Tubular Ball Knob Lock. Fire Rated Certification: UL Listed with 3-hour fire rating and ANSI A156.2 Grade 2 compliance. Durable Material: Constructed from Zinc Alloy and Stainless Steel 304 for long-lasting performance. Versatile Finishes: Available in PB, SB, SN, SC, CP, ORB, PVD, AC, CB, and MB finishes. Wide Door Compatibility: Fits wooden, metal, and fire-rated doors with thickness 35-50mm. Comprehensive Warranty: Includes a 5-year mechanical guarantee for all products. OEM and ODM Support: Professional OEM and ODM services for famous brands. Free Sample Offer: Provides 3 free samples for evaluation upon request. Fast Response Time: Reply to price inquiries within 24 hours via email or phone.