16 Koetter Woodworki ng, Inc. • www.koetterwoodworking.com 18136-R-b 18168-og-b* 18136-og-b 18104-og-b 16104-b 9/16\" x 4 1/4\" 9/16\" x 5 1/4\" 9/16\" x 4 1/4\" 9/16\" x 3 1/4\" 1/2\" x 3 1/4\"BAS E S * = Skirtboard also available in this profile. See Stair Part Price Book for available species.