The composite shell is adopted to greatly reduce the inconvenience in operation due to the weight of the tool. The unique twin hammer structure guarantees the avoidance of damage under the over-loading conditions. Its torque is as high as 1356Nm, with the working pressure of 0.63MPa, the rotating speed higher than 480 per minute. Users can fully sense its convenience and the charm of high-end products. The normal sleeve is made of 50BV30 chrome-vanadium steel alloy through special processing arts, ensuring the high performance and endurance of the products. The plum-blossom-shaped-hole design is made for both the hexagonal sleeve and the 12-angle sleeve, moving the point of strength for the sleeve and the screw cap to the surface of the screw nut edge. Such a design has the following characteristics: ?15 percent of the torque force is added to make it easier to screw tight or open the screw cap and enlarge the life span of the screw nut. ? Reducing the wear and damage to the screw nut edge. Even for the damaged or worn screw nut, it can also secure it or open it easily. ? Adding the strength of security, avoiding the slippage in operation and enhancing its safety. It is especially useful for the rusty or unable-to-open screw nuts. ? In compliance with the national standards of Germanyâ€”the DIN3121, the pneumatic sleeves are made of the high-level chromium-molybdenum alloy steel of SCM 440. With the special processing, the wall thickness is enlarged. The strength is greatly improved to adapt the product to the instant strong impact during the operation of the pneumatic tools. The advantages include but are not limited to the followings: ? Utilizing the high-level chromium-molybdenum alloy steel with increased wear resistance and life span. ? Forged shape with proper hardness. Bearing high resistance to impact and shock with totally new and unique design.? Undergoing multiple heat-processing arts with sophisticated organization. ? Bearing high precision, effectively reducing the wearing of the screw.