round head washer stainless steel screw 1)Standard:DIN,ANSI,BS,JIS, ... 2)Size:M3-M76 3)Finish:Tin,Nickel,Chrome round head washer stainless steel screw1) Standard: DIN, BS, IFI, JIS, ISO ... us.9) Working Process Include: cold punching, and machining, also CNC machine, can do OEM order.