... *13.8 2.Finish:Ni-plated 3.material:carbon steel 22A machine screw:Features for this item:1 ... . material: carbon steel 22A2. size:M4*13.83.head: cheese ... GB BSW, JIS, ANSI,DIN, Non-standard2.Material: carbon steel alloy steel,aluminum3.Finish: white/yellow/blue/black ... information! Product view: Workshop overview: M4 carbon steel machine screw phi-slot Ni-plated