Chip board screw 1.Standard:GB,DIN,ANSI,BS,JIS 2.Material:1018 or 1022 carbon steel 3.D:M2.5-M6 4 ... .L:10-300mm Chip board screw 1.Standard:GB ... ,DIN,ANSI,BS,JIS2.Material:1018 or 1022 carbon steel3.Finish: Zinc ... business.Any questions,pls feel free let us know.Thanks Chip board screw