50pcs M4.2 Flat Head Self drilling Self tapping Screws Drilling Tail Screw Set (M4.2*50)

1、100% brand new and high quality. 2、These self-drilling screws has pointed drilling tails no need of auxiliary processing. 3、They can directly drill tap and lock on material at the same time safe and easy to operate greatly saving construction time. 4、 Compared with ordinary screws they have high maintenance force and will not be easily loose for long time. 5、 Mainly used for fixation of color steel tile in steel structure or for simple construction of thin sheet.