This Beadsmith® wooden mandrel set can be used to make large jump rings and to create curves and loops in wire jewelry designs. Ideal for continuous crcle aluminum wire jewelry projects. Set includes 6 round wooden mandrels in a compact, labeled storage case.Sizing Information:1/4" (4 mm) diameter3/8" (9.5 mm) diameter1/2" (12.7 mm) diameter5/8" (15.9 mm) diameter7/9" (22.2 mm) diameter1" (25.4 mm)