Standard:ISO Material:C1022A Color:BLAK ,GRAY ,SILVERY Product name:DRYWALL SCREW Finish:Plain Surface treatment:BLACK STE ,GRAY STE ,GALVANIZED , NICKEL COATED Certificate:SGS Size:3.5X19 25 32 38 50 60 75MM PACKAGE:BOX AND CARTON DIA:6# 8# 10# 12# THREAD:DOUBLE LINE