<h3>Key features</h3><ul> <li>Premium Bolts and Nuts Assortment: Features high-tensile 12.9 grade hex screws and nuts for superior strength and durability. Paired with 8-grade spring washers, 12-grade flat washers</li> <li>960-Piece Hardware Assortment: This hex head screw bolt kit includes 960 pcs: M4, M5, M6, &amp; M8 hex head bolts, matching nuts, flat washers, and spring lock washers in 33 essential sizes (lengths 12-40mm), providing a complete metric bolt and nut assortment for any project.</li> <li>Storage Toolbox: Comes organized in an sturdy, reusable, and detachable DIY toolbox. This industrial fastener kit ensures easy storage, portability, and long-term organization.</li> <li>Versatile Heavy-Duty Applications: Perfect for machinery repair, automotive maintenance, industrial equipment, construction, and serious DIY projects. This multi-size bolt kit tackles demanding tasks where high-strength, metric hardware is required.</li> <li>Detailed Specifications &amp; Wide Size Range: Includes key sizes like M4 (12-30mm), M5 (16-40mm), M6 (12-40mm), and M8 (16-40mm). All metric hex bolts feature standard hex head sizes (e.g., M4: 7mm, M5: 8mm, M6: 10mm, M8: 13mm) and standard metric thread pitches for universal compatibility</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>