Seemingly endless polishing lines applied with Scotch Brite give the hairline, long-grain, or fine-line finish its unique appearance and
make it more reflective than a No. 4 polish.

Small scratches can be repaired in the field with Scotch Brite pads of equivalent grit or roughness.

The Hairline finish is sometimes inaccurately sold as either a No. 5 or No. 6 polish. The No. 6 polish defined by ASTM A 480 and the Hairline finish have no visual similarity and are created by different methods.