1100% brand new and high quality. 2These self-drilling screws has pointed drilling tails, no need of auxiliary processing. 3They 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.Features: _x000D_100% brand new and high quality. _x000D_These self-drilling screws has pointed drilling tails, no need of auxiliary processing. _x000D_They can directly drill, tap and lock on material at the same time, safe and easy to operate, greatly saving construction time. _x000D_Compared with ordinary screws, they have high maintenance force, and will not be easily loose for long time. _x000D_Mainly used for fixation of color steel tile in steel structure, or for simple construction of thin sheet. _x000D_These screws cannot be used for bonding between metal. _x000D__x000D__x000D_Specification: _x000D_Material: Zinc plated iron _x000D_Head Type: Flat (countersunk)_x000D__x000D_Size: M4.2*13, M4.2*16, M4.2*19, M4.2*25, M4.2*32, M4.2*38, M4.2*50 (Optional) _x000D_Quantity: 50pcs _x000D_Weight: 46g~161g / 1.6oz~5.7oz (approx.) _x000D__x000D__x000D_Package list:_x000D_50 * Screws