1600Pcs Metric Screw Assortment M2 M3 M4 M5, Grade 12.9 Alloy Steel Metric Bolts Product Details ?Well-made Metric Bolts and Nuts Assortment? : 100% made of high quality 12.9 grade alloy steel, high strength, superior rust resistance and excellent oxidation resistance, perfect for all weather use. Metric screw assortment conforms to the standardized metric system, the average error is less than 0.01 mm. ?1600pcs 16 Standard Size?: Various M2 M3 M4 M5 screws and bolts with lock flat washers, total 16 sizes : M2 screws: bolt length: 4mm,6mm,10mm,12mm, M3 screws: bolt length: 6mm,8mm,12mm,16mm, M4 screws: bolt length: 8mm,12mm,16mm,20mm, M5 screws: bolt length:12mm,16mm,20mm,25mm, 1600pcs in total, meet all demands. 4 hex wrenches customized for each size are provided in the kit to make the screws easier to use. ?Upgraded Zinc Plated Screw Set?: All screws without adding any anti-rust oil, featuring upgraded black zinc plated, extend the rust-proof time, cleaner and tidier. It is an ideal choice whether for your own use, or as a gift for family or friends. ?Nice Storage Box?: The bolts and nuts kit are packed in a reinforced box with separate compartments and sturdy latches, clean and neat, keep everything well organized, easy to store and carry, clear label sheets are pasted on both the inner and outer lids, allowing you to quickly see which sizes you need to use and refill. ?Wide Applications?: This metric bolt assortment can be widely used in all kinds of precision machinery, 3D printers, electronics, home appliances, toys, etc. We offer a 24-month warranty, contact us freely if you have any problems and questions. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.