WAVE PLATE HEAD SCREW 1.ISO,ANSI,JIS,DIN,BS& non- ... 3.Grade:4.8 ,6.8,8.8,9.8........ WAVE PLATE HEAD SCREW,DOUBLE HEAD SCREW,KNURLED HEAD SCREW A ... Most scrows are available.such as :Self tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M ...