This high-security cylinder and key set gives you reliable protection and practical compatibility for most home doors. Key benefits Prevents unauthorized key copying: The supplied key design blocks casual or opportunistic duplication by people who occasionally have access to your keys. Broad door compatibility: Works with all door types, including patio/terrace doors made of wood or metal, window-doors, and composite doors. Smooth, secure operation: A unique anti-impact mechanism (no catch pins) ensures the cylinder key turns smoothly for authorized users while resisting bump-key attacks. Multi-layer physical protection: Built-in anti-pick, anti-drill, and anti-impact features reduce common entry methods and increase home security and peace of mind. How it solves common problems Stops easy key duplication when service providers, cleaners, or temporary guests handle your keys. Protects vulnerable door types (e.g., patio or metal doors) with tailored cylinder security, so you do not need separate solutions for different materials. Prevents forced entry methods like drilling, picking, or bumping while maintaining easy day-to-day use. Practical features and performance Function: Cylinder lock with a specially designed key for restricted copying and enhanced resistance to picking, drilling, and impact. Compatibility: Suitable for a wide range of residential doors (wood, metal, window-doors, composite). Operation: Smooth key rotation thanks to the anti-impact design that avoids traditional catch pins while blocking bump-key access. Use scenarios Family home patio door: Install on a wooden or metal patio door to prevent unauthorized duplication and protect a common point of entry. Rental or shared property: Add to doors where cleaners, contractors, or temporary tenants have keys to reduce the risk of unapproved copies. Front or utility door on composite frames: Upgrade cylinder security to resist picking, drilling, and impact attacks without sacrificing everyday ease of use. What you get A cylinder and key solution focused on preventing key copying and defending against picking, drilling, and impact-based attacks while remaining compatible with most residential doors.