SmartPro Tools SPT 3000-B Speed Driver 13 Piece Geared Screwdriver Set Patented planetary gear design allows you to work 4 times faster than with ordinary screwdrivers. Patented switching mechanism allows on the fly switching between the 4:1 speed mode and the 1:1 standard mode. 3 position ratchet feature; forward, reverse and locked. Handle is made from a chemical resistant material and has a storage device to hold the 12 included screwdriver bits. Standard 1/4" magnetized hex opening to hold all standard driver bits.