Material: carbon steel
Color classification: M3.5*16 (about 513 pieces for 500g) M3.5*20 (about 390 pieces for 500g) M3.5*25 (about 369 pieces for 500g) M3.5*30 (about 293 pieces for 500g) oz) M3 .5 * 35 (500g approx. 261pcs) M3.5 * 40 (500g approx. 237pcs)
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