the Gator-Grip Super-G all in one system turns into a high torque screw driver.This single handed ergonomically designed operational system instantly drives over 1000 fasteners with quick ratchet action: The socket self adjusts for standard and metric from 1/4" to 3/4", and metric 7mm-19mm. Gator Grip especailly works great on rusted and damaged heads. Push the Gator-Grip Super-G onto a fastener and start ratcheting immediately; the pins automatically adjust to fit and grip. The powerful contoured comfort fit handle maximizes turning torque by keeping the wrist in line with the tool. Switch from install to remove by rotating the selector barrel. The tool transforms into a high torque screwdriver with a retainer cap and 4 hex bits included. the driver has over 200 inch pounds of torque.