The Sealey Impact Bar 550mm 1/2"Sq Drive is specially designed for use where nuts/bolts are not easily accessible.Ideal tool for loosening crankshaft pulley bolts.Easy to useFeatures hand guard for extra safety.The Sealey Impact Bar 550mm 1/2"Sq Drive is specially designed for use where nuts/bolts are not easily accessible for air impact tools, or where air is not available. You simply fit the required impact socket, keeping the arm at a right angle to the shaft for maximum torque, and strike the top of the tool with a hammer to shock the nut or bolt loose. It is the ideal tool for loosening the crankshaft pulley bolts and features a hand guard for extra safety.