There are hundreds of types of screws, and you must be wondering as to why there is a type of ShehKai’s screw with a pair of wings. In fact, it is mainly to solve the problem of wooden boards being jacked and with the surface cracked when locking wooden boards and steel plate composites together.

ShehKai's thoughtful solution - bimetal rmr. screw, adds a pair of wings. When you use it to fix wooden boards and steel plates, the wing design will first enlarge the holes in the wooden boards so that the threads of the screws can pass through smoothly to avoid lifting or cracking the boards due to the rotation of the threads and chip/swarf being drilled out. With this design, as it drills through the steel plate, the wings will automatically fall off to ensure that the threads of the screws can fully and tightly combine with the steel plate. This product fully takes into account the differences in board characteristics, provides the greatest convenience to the user, and can also improve the construction quality.