Room Ball Door Knob Interior and Exterior Door Lock for Bedroom and Bathroom Doors. Durable SS201 Material: Constructed from high-quality SS201 stainless steel for long-lasting performance. 3-Year Warranty Coverage: Includes a comprehensive 3-year warranty for peace of mind. Customizable Door Thickness: Door thickness fits can be customized to meet specific installation needs. Modern Design Style: Features a sleek modern style suitable for bedrooms and bathrooms. Standard Backset Size: Equipped with a 70mm backset for standard door compatibility. Versatile Usage: Ideal for household doors, specifically designed for bedrooms and bathrooms. Secure Key Lock Type: Provides reliable security with a keyed entry mechanism. A-Grade Anti-theft: Meets A-grade anti-theft standards for enhanced safety.