Sturdy & Durable: BNUOK M4 socket head cap screws are made of high-quality 12.9 Grade alloy steel, which has high hardness, good rust resistance, strong and durable. It has good corrosion resistance and can be used for a long time M4-0.7 Bolt Specification : Thread Diameter, 4mm; Thread Pitch, 0.7mm; Thread Length, 12mm; Head Diameter, 7mm; Head Height, 4mm; Drive Type, Allen Hex Socket; Allen Hex Drive Size, 3.08mm Wide Applications:The m4 screw is widely used for 3D printers, RC car, machinery repair, instruments, electronic products, DIY Project, household appliances, lamps, cabinets and bicycle repair Well-made M4 Screws: M4 x 12mm screws is features a design with a hex socket drive that provides more torque and more stable performance.These M4 bolts with clean threads, uniform pitch, no residual burrs, true to size Package Included: You will get 120pcs M4 bolts and 1pcs hex spanner.We promise a 24-month warranty, if you have any problems, please feel free to contact us, we will solve your problem within 24 Hours.