About screwdriver

Cross slotted screw is an improvement of slotted screw. When we use it in our daily life, we will find that the slotted turn of the screw is easy to run off and slip. The screwdriver can well grasp the center of the screw on the nut. 1936, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress of screw basic technology. Different from the traditional slotted head screw, the edge of slotted head screw. This design is very popular because it is not easy to center the screwdriver automatically.