... head wood screws 5/16*2-1/2 (+3 Cr black) 1.standard:ANSI 2.material:35ACr 3.grade:5 4 ... .finishing:+3 Cr ,black zinc ANSI hex head wood screws 5/16*2-1 ... /2 (+3 Cr black)1.Metail:Carbon steel,stainless steel,35CrMo,35#.etc.2 ... ,GB,JIS,Non-standard,JB/T4.Surface:plain,zinc plated,black oxide,hot dip galv.etc.5.Packing:in bulk,15-25kgs ...