Smooth, reliable operation Precision nickel cylinder delivers even, jam-free key rotation for effortless locking and unlocking. Cylinder wrench turns smoothly while preventing access by impact and bump keys. Advanced anti-intrusion protection Built-in anti-pick, anti-drill and anti-bump features for strong resistance to common break-in techniques. Unique anti-bump design without trap pins maintains smooth operation while blocking bump keys. Flexible compatibility and sizes Available in multiple sizes to suit different door thicknesses and installation needs. Offered as double cylinder or button (thumb-turn) cylinder options so you can choose the configuration that fits your door and use case. Durable construction and broad application Nickel cylinder finish for corrosion resistance and long service life. Compatible with most doors that have a keyhole: wooden doors, composite doors, metal doors, interior doors, front doors, patio doors, French doors and more. Practical benefits Improves theft protection and ease of use without requiring costly handle upgrades or extra security devices. Simple replacement or upgrade for existing cylinders; maintains smooth operation and enhanced security. Support and warranty If you encounter any issues, contact us—we aim to provide a satisfactory response within 24 hours. Typical use scenarios 1. Residential front door: Replace an old cylinder with a nickel, anti-bump cylinder to improve lock security and ensure smooth daily use. 2. Patio or French doors: Use the appropriate size double or button cylinder to secure patio and French doors while keeping easy thumb-turn operation from the inside. 3. Apartment or interior entry: Install the button (thumb-turn) cylinder for quick, jam-free access and extra protection against lock-picking and drilling. Key specifications at a glance Material: nickel cylinder Security features: anti-pick, anti-drill, anti-bump (no trap pins) Configurations: double cylinder, button (thumb-turn) cylinder Sizes: multiple sizes available to fit most doors with keyholes Compatibility: wooden, composite, metal, interior, front, patio, French doors, etc.