M4 4.0 0.7 2.5 mm 7.6 2.2 8 / 10 / 12 / 16 / 20 / 25 mm. Rustproof A2 (304) stainless steel — ideal for marine, automotive, and outdoor projects. M4 0.7 mm 7.0 mm 3.2 mm A2 Stainless. Material A2 Stainless Steel (Grade 304).
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