This is a set of 3mm stainless steel button head cap screws☆ Although new, they are packaged by hand. Iron nuts, washers, and a hex wrench are included as a bonus…★ The lengths are: 8, 10, 12, 15, 18, 20, 25, and 30mm, with 10 of each length★ Thank you for your interest. Type...For radio-controlled models