Tap wrench is a special wrench, which belongs to light level with the heavy wrench, tap wrench by the high quality carbon steel or alloy steel forging from the overall, tap wrench working end 12 angle plum shape, Tail end is knocking widened thickened wrench with the design fair, the structure is not random, high material density, strong anti-strike capability, not off, constantly, bend, high dimensional accuracy, durability and other characteristics. tap the use of the use of leverage wrenches wrenching bolts, screws, nuts and other threaded bolts or nuts adherence ashamed or firmware sleeve hole hand tools. http://www.hbbtglj.com/tzbs/