Nindejin Metric Flat Washers And Button Head Socket Cap Screw Bolts Product Details Screw head style is button head and the drive style is hex socket. Screw bolts and nuts are made of 304 stainless steel with metric size M2 M3 M4 M5. 880pcs included M2 M3, M4, M5 in 8mm/ 12mm/ 16mm/ 20mm screws with matching nuts and washers. All screws and nuts are packed in a box for your convenience and storage. 304 stainless steel with superior rust resistance to ensure a long time using. Socket head screw bolts suitable for home, office, automotive, bike and shop. Perfect to replace broken and missing screws. Ideal for electrical connections in household and commercial appliances, automotive and marine applications where power supplies have threaded/bolt type connections. If you have any questions about NINDEJIN screws, welcome to contact us by email or Q A any time. 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.