Ajuer 1305 Pcs.Metric Bolt Assortment M2 M2.5 M3 M4 12.9 Alloy Steel Hex Socket Product Details High quality ?Screw is 12.9 grade Black Zinc Plating On carbon steel. They have resistance to rust and excellent resistance to oxidation in a bad environment such as high temperature, cold weather and high humidity areas that can guarantee long time Various screw sizes: There are 24 options to meet different needs. It is a very important hand tool for the family. and a single bag and partition board can prevent hardware fittings from being mixed. The nuts and washers are made of 304 stainless steel with black zinc. Has better anti-oxidation and anti-corrosion effects. This screw sleeve box is widely used inelectronics, electrical appliances, chemicals, water, machinery ?appliances, furniture?proportional remote control vehicles, tracks,trucks?baby carriages and many other areas Packaging content?M2*4 M2*6 M2*10 M2*14 M2.5*6 M2.5*8 M2.5*10 M2.5*12 M3*6 M3*8 M3*10 M3*12 M4*10 M4*12 M4*16 M4*20 screws,M2 M2.5 M3 M4nuts,washers and the corresponding hexagon wrench.Not suitable for kid under 5 years due to small parts 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.