50pcs M4.2 Self-Tapping Screws Flat Head Self-Drilling Screw for Metal Sheets Roofing Windows(M4.2 * 50) - Product Features
These Self-tapping Screw are mainly used for fixation of color steel tile in steel structure, or for simple construction of thin sheet.
They can directly drill, tap and lock on material at the same time, safe and easy to operate, greatly saving construction time.
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These self-drilling screws has pointed drilling tails, no need of auxiliary processing.
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