Allen wrench tool for a hex socket head screw.
The tool is simple, small and light, and the six contact surfaces between the screw and the tool are not easily damaged during use. Tools can be manufactured very cheaply, so often including products that require end-user assembly, either end of the tool can be used to take advantage of reach or torque.
The tool can be used for stop screws, the torque is limited by the length and thickness of the limit, the tool on both ends can be used to utilize the reach or torque, and many manufacturers have adopted the relevant screws of the hex socket to assemble bicycles, and furniture that can be assembled at any time.
The Allen key size is sometimes referred to as "M" followed by the size in the tool or socket, eg "M6", although this may be confused with the standard use for "; M6" which refers to the thread of a meter screw or bolt.
Use a hexagon wrench, if the metric system uses the imperial system or the imperial system uses the metric system, it will cause damage to the screw or tool.
Allen wrenches have a ball at the end, and as the maximum allowable angle increases, the neck size decreases relative to strength. Therefore, the size of the ball head and neck affects the maximum allowable angle and strength.
