Carbon steel A 20PCS M3: 20PCS M4: 20PCS M5: 20PCS M6: 20PCS M8( Color zinc ). carbon steel B 20PCS M3: 20PCS M4: 20PCS M5: 20PCS M6: 20PCS M8( White zinc). 304 stainless steel 20PCS M3: 20PCS M4: 20PCS M5: 20PCS M6: 20PCS M8.
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