homescrewdriver-bitswhat-is-a-screwdriver-bit What is a screwdriver bit? Chris 1st January 2019 412 Views SaveSavedRemoved 0 What is a screwdriver bit? Shop for Screwdriver bits A screwdriver bit is a detachable metal bit used for inserting and removing screws. Screwdriver bits are used in hand-held power tools such as cordless screwdrivers or drill drivers. Screwdriver bits come in many different shapes and sizes depending on the type of screw you want to insert.