A 45-centimeter-long door knocker with rectangular ends, used for exposure.

Product Description: Our door rings are made of high-quality materials and have undergone a special surface treatment, making them sturdy and durable. They effectively protect wires or cables from damage caused by harmful substances or harsh weather, ensuring safe use. Furthermore, they can be easily installed using the included screws. Our door rings are widely used in internet-connected door locks, access control systems, video doorbells, and other fields. Product Features: Our door rings are made of high-quality materials and have undergone a special surface treatment, making them rust-proof, corrosion-resistant, sturdy, and durable. They effectively protect wires or cables from damage caused by harmful substances or harsh weather. They can be easily installed on doors using the included screws, without the need for special installation tools. The gooseneck tube is flexible, allowing wires to pass through easily without damaging the wires on the inner surface. They are widely used in internet-connected door locks, access control systems, video lines, network lines, police systems, video doorbells, and other fields. Product Specifications: Condition: . Material: Stainless steel. Color: As shown in the picture. Overall length: Approx. 450 mm (17.7 inches) Gooseneck tube diameter: Approx. 12.7 mm (0.5 inches) Rectangular end dimensions (L x W): Approx. 48 x 40 mm (1.89 x 1.57 inches) Weight: Approx. 174 grams. Package contents: 1 x door ring, 8 x screws. 1. Our door rings are made of high-quality materials and have undergone special surface treatment, making them rust-proof, corrosion-resistant, sturdy, and durable. 2. They effectively protect wires and cables from damage caused by harmful substances or harsh weather. 3. They can be easily installed on doors using the included screws, without the need for special installation tools. 4. The gooseneck tube is flexible, allowing for easy wire passage while keeping the inner wall open. 5. Widely applicable in internet door locks, access control systems, video lines, network lines, police systems, video doorbells, and other fields.