describe You will receive 4 types of 16/20 doorbell screw replacements, 4/5 of each type, T16 (short), T16 (long), T5 (short), and T5 (long); A sufficient quantity can meet your various purposes and replacements. These doorbell screws are made of industrial hardened carbon steel, which is sturdy and durable. The replaceable safety screws are galvanized to prevent corrosion and rust. Replace with 4 different types of ring screws for your convenience. High performance: Made of thick and flat doorbell replacement screws to ensure appropriate safety, increase durability, and properly adhere to the bracket attached to the doorbell, providing you with a good user experience. Widely applicable: These doorbell accessory screws are suitable for ringtone devices, including doorbells, doorbell 2, and doorbell professional versions. Specifications: Color: Black Material: Carbon steel Packaging includes 16/20 screw 【High-Quality Materials】Crafted from premium, durable materials to ensure longevity and superior performance. Each product is meticulously tested to meet high standards of quality and safety. 【Exceptional Performance】Engineered for high efficiency and effectiveness, this product delivers outstanding results every time. Its advanced features ensure consistent performance, making it a reliable choice for your needs 【Versatile Functionality】This product is multifunctional and can be used for a variety of tasks, providing you with the flexibility and convenience needed to handle multiple uses with a single tool. 【Eco-Friendly and Sustainable】Made with environmentally conscious practices, this product is eco-friendly and contributes to sustainability efforts. It is designed to minimize waste and reduce environmental impact. 【User-Friendly Design】Ergonomically designed for ease of use, this product offers intuitive controls and a comfortable grip, making it perfect for both beginners and experienced users.