Metal material, durable and portable, flexible out shield protects your hand while inside shaft rotates Bit holder keeps fasteners and bits secure while driving. Ball detent design for quick connect or disconnect and ensuring stay in place while driving Flexible out shield protects your hand while inside shaft rotates. Bends, twist and turns to use drill into tight and confined spaces It can be either used for general cartridge-type hand drill or electric screwdriver. Mainly used in computer chassis, electrical cabinets, furniture,electrical appliances and other nArrowhead space screwdriver can not work in an environment There are one hex socket and three Squares adapters in different sizes and you can use the proper one for various needs. Universal SDS plus shank would fit most electric screwdrivers, drills and chuck.