Self Drilling Screw
Drywall screw is often used in production and life to install various gypsum board, ceiling ceiling, light partition, light steel keel and so on. It's a very common type of screw. The biggest feature of its appearance is the shape of the bugle head, there are two lines and single lines. There are a variety of surface treatments, as well as fine and coarse thread. Coarse thread are usually used for wood, fine thread are usually used for metal iron.
