The Beadsmith Bead Boards makes creating custom jewelry easier than ever! There are 8 circular channels, specifically for designing bracelets and anklets. The sizes include 5.5” (14cm), 6” (15.2cm), 6.5” (16.5cm), 7” (17.8cm), 7.5” (19cm), 8” (20.3cm), 8.5” (21.6cm) and 9” (22.8cm).