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