self tapping screws. all sizes available raw material:C1022 color:galvanized, black, plain self tapping screwsall sizes available raw material:C1022color:galvanized, black, plainpacking:color box.common box.in bulk.our production are low price,high quality,we are glad to do business with you .any size can be provided according to your requirements. countersunk head pan head self tapping screw