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1)Standard of screw: DIN95/96/97, DIN7995, DIN7997, BS1210, BS1210 Hardened
2)Size: M2-M8,ST2-ST8
3)Material: 6A,8A,brass,stainless steel aluminum and so on.
4)Surface of screw: plain, zinc Cr+3,Yellow Zinc Cr+6
5)Packing: bulk, box packing