1. Reliable Cable Extension Protection: These protective sleeves are designed as exposed installation accessories for door frames, providing a reliable solution for wiring needs. 2. Organized and Visually Appealing Keep your wiring neat and visually appealing with these protective sleeves, enhancing the overall aesthetics of your installation. 3. Effective Damage Prevention: Prevent intentional wire cutting or tearing with these exposed door knockers, ensuring the integrity and functionality of your electrical system. 4. for Access Control Projects Compatible with security access control projects, these wire protectors allow the installation of electric locks, door sensors, and alarm switches on doors. 5. Easy Installation and Sleek Design Thread a wire through the door gap and clamp it onto the door frame for simple installation and an attractive, elegant appearance. 6. Specifications Product Name: Protective Sleeves; Material: Stainless Steel; Size: 201 Size: approx. 422×8 mm, Metal Tube Size: 400 mm, Inner Diameter: 6 mm; 301 Size: approx. 422×8 mm, Metal Tube Size: 400 mm, Inner Diameter: 6 mm; Color: Silver.