PETOL-TITAN VALVE WHEEL WRENCHES are used to provide leverage on hand operated valve wheels. This series of wrenches permits a smooth snap hammer-action to make opening and closing stubborn valves easy. Each wrench will fit a variety of sizes and shapes of valve wheels. The special shaped opening in the wrench reduces the chance of slippage when working in overhead or crowded positions. WARNING! Use as a hand tool only. Do Not Strike, use a cheater or extend handle. SERIOUS INJURY may result if used improperly.