Thank you for choosing our product. Our shop' s first Shishi comes to our store for each person and has a good shopping experience. Small size, light weight, easy to carry& storage.3.4: 1 torque multiplication. Accuracy tolerance +-5%. The tool is adapted Compatible with tire change of car and van in automotive repair industry. Supplied with the rubber- cover reaction bar Compatible with tire rim protection purposeDetails: 01 Input Square(F): The material is Cr- V alloy steel. 02 Output Square(M): The material is Cr- V alloy steel brings better stability and reliability. 03 Main body: Small and light weight benefits as socket size is easy Compatible with operation. The mechanism device is patented. The material is Chrome molybdenum alloy steel. 04 Handle: The movable reaction handle is suit Compatible with different working place.