These_x005F_x005F_x005F_x000D_screws and nuts are made of 12.9 grade alloy carbon steel, which provides strength and is commonly used when requiring higher mechanical properties.There are many length for your choice which can _x005F_x005F_x005F_x000D_be commonly used in home and office appliance, machinery, furniture, repair and DIY inventions.Features:Made of 12.9 grade alloy carbon steel, which provides strength and is commonly used when requiring higher mechanical properties.Ideal for use in confined areas where you need hex socket cap head screws.Fixing component, industrial and construction fasteners.17 common sizes and different quantities that you can choose for general purpose use.Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry.Specifications:Material: 12.9 grade alloy carbon steelColor: Black_x005F_x005F_x005F_x000D_Type: Hex socket cap headSize:(optional)M3*4mm(fully-threaded)M3*5mm(fully-threaded)M3*6mm(fully-threaded)M3*8mm(fully-threaded)M3*10mm(fully-threaded)M3*12mm(fully-threaded)M3*14mm(fully-threaded)M3*16mm(fully-threaded)M3*18mm(fully-threaded)M3*20mm(fully-threaded)M3*22mm(fully-threaded)M3*25mm(fully-threaded)M3*30mm(partially-threaded)M3*35mm(partially-threaded)M3*40mm(partially-threaded)M3*45mm(partially-threaded)M3*50mm(partially-threaded)Quantity: 24pcs, 50pcs, 100pcs(optional)_x005F_x005F_x005F_x000D_Package Includes:1 Bag x Screws _x005F_x005F_x005F_x000D_Note:1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding._x005F_x005F_x005F_x000D_2. Monitors are not calibrated same, item color displayed in photos may_x005F_x005F_x005F_x000D_be showing slightly different from the real object. Please take the _x005F_x005F_x005F_x000D_real one as standard.