86 socket head screw specification

The specification diameter is 4mm, the standard configuration is 35mm, and the length is between 35 mm. The 86 socket refers to the socket with overall dimensions of 86mm in length, 86mm in width and 18mm in height. The diameter of the screw is 4mm, the standard configuration is 35mm, and the length is between 35 mm. The screw is a tool to tighten all parts of the object step by step by using the physical and mathematical principles of circular rotation and friction of the inclined plane of the object.