Material: High high quality Alloy Steel Grade 8.8, with high corrosion resistance and chemical resistance.Hexagon bolts could be widely used in household appliances, digital products, communique products, automobiles, bicycles, furniture, deliver assembly and other mechanical industries.Thread Diameter: 6mm; Thread Pitch: 1mm; Screw Length: 12-60mm.Package Included: 10-25 PCS hex head screws.Any time you need us, please contact us via e-mail or Q&A. We will present you with legit service and respond to you as quickly as possible. If you aren't convinced with the product, you may get a full refund, or substitute it, you would rest assured to buy.