Square Drive Alloy wrenches ensure extra reliability through a strong uni-body that does away with pinch points and reduces side loading. A special alloy is used in the square drive that makes this tool tougher than other wrenches on the market. These torque wrenches do no rely upon a reaction pawl, operational problems such as tool lock-up are eliminated. They have very high torque-to-weight ratio, high speed, double-acting operation and high degree of rotation angle and never-jam mechanism. It has high repeatability, with accuracy ± 3%. Also it has slim nose radius and 360 degrees swivel hose connection and 11,600 psi as maximum operating pressure. No tools are needed to reverse square or Allen-key drives for tightening or loosening.