A pattern book by Ralph Griswold presenting all regular right twills for 2 to 10 shafts, shown as small drawdown thumbnails grouped by size from 2 x 2 to 10 x 10. Each thumbnail is labeled with the catalog number of its WIF file at Handweaving.net, so readers can browse and identify patterns to download. Left twills can be obtained by reflecting the right twills. The patterns were generated by a program using the standard definition of twill counters.