It includes 285pcs flat head and 285pcs round head, both of them contains M3/M4/M5/M6 specifications and different lengths. So, when you want to use a certain screw, you don't have to waste time buying it separately, because they are at your hand. 285pcs Flat head self tapping screws: 55Pcs M3x20mm,50Pcs M4x12mm,40Pcs M4x20mm,40Pcs M4x25mm.
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