The Econo Twist n Curl is an ingenious and inexpensive tool used to create an endless variety of wire beads, coils, and jump rings. The tool includes 6 different mandrills. 3 round mandrills, measuring 2.5, 5 and 6.5mm. One Rectangle mandrill measuring 2.5x x10mm, One Square mandrill measuring 6.5mm and One triangle mandrill measuring 6.5mm. The Econo twist N Curl can be used with 22-30 gauge wire . The tool measures 8 inches high x 4.5 inches wide when full assembled and comes with full instructions, including tips and ideas..