Hex screwdrivers or hex bit screwdrivers have hexagonal shaped tips that are designed to fit into the recesses or sockets of hex screws or bolts. Hex bit screwdrivers have removable bits that can exchanged for a range of different sizes to match the hex screw or bolt they are being used with. Hex screwdrivers are commonly used in DIY applications such as furniture assembly as well as in appliances and machinery where hex screws and bolts are used.