<h3>Key features</h3><ul> <li>Product Details This complete 200PCS M6 Bolt Assortment covers 7 commonly used lengths: M6x8/10/12/16/20/25/30mm. Precision-engineered to strict metric standards with an average tolerance of less than 0.01mm, and comes with a balanced supply of matching hex nuts and washers. Includes a free hex key (Allen wrench) for immediate use – no need to search for the right tool.</li> <li>Premium 12.9 Grade Alloy Steel Made from high-strength 12.9 grade alloy steel, this M6 Bolt Kit delivers excellent wear resistance, corrosion resistance, high load-bearing capacity, and toughness. An ideal choice for heavy-duty industrial applications and mechanical assemblies.</li> <li>Black Zinc Plated for Rust Protection This M6 Screws Assortment Kit features a black zinc plating finish that effectively resists rust while keeping your hands and tools clean. The plating adds hardness and basic wear protection, significantly extending the lifespan of the screws. A light yellow anti-rust oil is applied at the factory — this is normal and can be wiped off with a cloth if desired.</li> <li>Compartmentalized Storage This M6 Bolt Kit comes in a sturdy, transparent storage case with clearly labeled slots for each size. Quickly find the right screw at a glance — saving time and keeping your workspace neat. Perfect for workshop and job site storage.</li> <li>Wide Application These M6 Button Head Socket Cap Screws are ideal for industrial equipment enclosures, automotive interior trim and panels, CNC machinery covers, 3D printer frame assembly, electronics housings, and RC model chassis. Note: M6 is a medium-diameter screw — please confirm your size requirements before ordering.</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>