This image-filled title defines screwdrivers and its history. The four popular variants of the screwdriver explored in this title are the slotted screwdriver, Phillips screwdriver, screw gun and hex keys. Straightforward definitions along with labeled images will help kids understand the uses and value of each device. Simple sentences and tool-in-use photos will have young readers ready to get to work! Sandcastle is an imprint of ABDO Publishing Company.