cheap Self Drilling Screws Self thread screws Quick Details Place of Origin: Zhejiang, China Brand Name: DRILLMAN Standard: DIN Material: Carbon Steel Product name: self drilling screws Name: hex flange head self drilling screws Finish: zinc Color: Zinc White Surface treatment: Znic Plated Size: M4-42 Self-tap screw (self-tap screw) is a screwdriver that can make its own thread without first drilling. For a hard substrate of a certain metal or hard plastic, the self-tapping screw passes through the continuity of the thread on the screw. http://www.aobsmart.com/screws..../self-drilling-screw