The Lock Technology 13-pc SAE Shockit Line Wrench Set, No. LT1920, is designed to loosen fittings on steering, brake, AC, and fuel systems. Uses the force and vibration of an air hammer to enable safe and precise hammering with non-turning punch. Its compact design allows for use in tight places and is able to reach difficult line nuts with offset punch. The punch is kept from slipping by interlocking socket design. Also available as a 12-pc metric set (No. LT1930).