A screwdriver bit is a specialized tool designed to help fit and drive screws into different types of materials. They come in a variety of sizes and shapes, so they can be used for many different projects, from assembling furniture to tightening nuts and bolts. Screwdriver bits are usually made from chrome-vanadium steel and coated for extra durability. They are designed to help minimize slipping, stripping, and wear on the screws and materials being used. With the right bit, it is easier to get a tight, secure fit that will last.