Wood screws are mainly used for secure connection of wooden materials. They work with chipboard, MDF, softwood and hardwood. There are many types of wood screws available, complete with features such as shanks to avoid wood splint, twin threads for effective drive, and tips meaning holes don’t have to be pre-drilled. You can buy wood screws complete with various drive types and head shapes. The Pozidrive and countersunk head varieties are the most popular. Originally, wood screws were made of brass or steel and featured a shaft with increasing thickness in proximity with the head. It was necessary to drill a pilot hole for the secure fitting of this screw type. However, the modern wood screw has a shank of uniform size in relation to the head. This means that drilling a pilot hole isn’t always necessary.