Hex head self drilling screws

Mainly used in the steel structure of the color steel tile fixation can also be used for simple building sheet fixation.Material has iron, stainless steel two kinds of which stainless steel is divided into a variety of materials.Compared with ordinary screws, drilling screws have higher pulling force and maintaining force, and will not loosen for a long time after combination. It can be used, safely drilled and tapped in one time, and the operation is simple.