Model M2 M2.5 M3 M4. Category Shoulder Bolts. 3、Deep threads, clear and complete threads, no foreign matter, no missing teeth, no burrs, not easy to slip teeth, durable and practical. 1、The product is made of 12.9 grade high-strength carbon steel and 304 stainless steel, with high toughness, good hot and cold processing performance and excellent cutting performance.
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