The Lock Technology LT1900 Series Shockit Crows Foot and Line Wrenches Sets offer a quick method for fastener access and removal. Air hammer hyper sonic vibration is delivered with one of three offset, non-turning, 8mm radius tip Shockit punches directly to interlocking designed Shockit Crows Feet and Line Wrenches. The patented LT1900 series sets are available in SAE/metric heavy duty industrial/hydraulic (LT1900 and LT1910) and heavy duty automotive/hydraulic (LT1920 and LT1930) sizes. They are designed to easily remove difficult-to-access hydraulic fittings stacked together in hydraulic bank manifolds and steering, brake, AC, and fuel system vehicle fittings.