Key benefits Strong protection: Anti-pick, anti-drill and anti-bump features reduce the risk of forced entry and give you reliable home security. Smooth operation: The cylinder wrench turns evenly with no jamming, making locks easy to open and close every day. Versatile fit: Available in multiple sizes and in either double or button (thumbturn) cylinder styles to match different installation needs. Simple upgrade: Improves lock security without replacing handles or adding extra hardware—an efficient way to increase protection. What makes this product stand out Unique anti-bump design that does not use trap pins, blocking access by bump keys and impact keys while keeping cylinder rotation exceptionally smooth. Nickel cylinder construction for broad door compatibility and long-lasting performance. Designed to resist picking and drilling while maintaining user-friendly key operation. Key features Security: Anti-pick, anti-drill and anti-bump protections for better resistance to common attack methods. Anti-bump design: Special mechanism blocks bump and impact keys while ensuring smooth turning. Operation: Even, jam-free rotation when the key is inserted for reliable daily use. Styles & sizes: Choose double cylinders (key on both sides) or button/thumbturn cylinders (key on one side, thumbturn on the other) in a range of sizes to suit various door preparations. Material: Nickel cylinder suitable for indoor and exterior applications. Compatibility: Fits a wide range of door types including wooden doors, composite doors, metal doors, interior doors, front doors, patio doors, French doors and most doors with a keyhole. Practical use scenarios Front-door security upgrade: Replace a basic cylinder with this nickel anti-bump, anti-pick cylinder to strengthen protection against break-ins without changing the door handle. Patio or French door application: Use the thumbturn (button) cylinder for easy inside operation and secure keyed access from outside. Rental or multi-unit properties: Select different cylinder sizes and double-cylinder options to match varied lock preparations across apartments or offices. Customer support If you have any issues or questions about fit or function, contact us and we will respond within 24 hours to provide assistance. Compatibility and selection tips Available in multiple sizes to fit most common door lock setups; choose double or button style based on whether you need a keyed cylinder on both sides or a keyed/thumbturn combination. Suitable for most doors with keyholes—confirm cylinder length and style against your existing lock to ensure a proper fit.