The Klein Tools Grip-It Hex Set is designed to easily tighten and loosen hex screws. Its 9 hex keys are made from heat-treated alloy steel, and they are square-cut for a full-depth fit into hex sockets to prevent slippage and stripping. The hex key system folds down to fit in your pocket or tool box.PRODUCT FEATURES:- Handy sets fit your pocket or tool box easily and help eliminate the lost-key problem- Tough, heat-treated alloy steel- Hex-key ends are square-cut for a secure full-depth fit and maximum contact with the hex socket to prevent slippage and stripping of the socket- Holder serves as a handle- Two key positions (straight-out or right angle) for extra leverage