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 . 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