【Product details】---thread pitch:0.4mm,thread diameter:2mm,head diameter: 4mm.Lenths of the thread :4mm/6mm/8mm/10mm/12mm/16mm.According with standardized metric system. And the average error is less than 0.01mm. 
【Not oily and rust proof】 These black zink plated finish screws are not oily, they will not dirty your hands or DIY items, and the rust proof performance is better than other oiled screws. 
【Good Storage and assortment】All These Screws are Packed In a Sturdy Easy-use Plastic Storage Box, Organized Conveniently and Easily. 
【High Quality】--- Made of high quality 12.9 grade alloy steel , which features is strength and offers good corrosion resistance in bad environment. 
【Brand guarantee】: Kadrick specializes in the production and development of fasteners. Our products have undergone rigorous testing, so you can use them with confidence. Additionally, we provide a 24-month after-sales warranty service. If you have any questions, please feel free to contact us.