Mandrel - Wire & Clay Forming Use as a mandrel for shaping bezels, bending and forming wire, metal clay and more. One interchangeable handle, four different shapes, multiple possibilities! Use this forming mandrel to create round, oval, triangle and square shaped jump rings, toggles, pendants, earrings, and other jewelry items.Oval measurements in millimeters: 28.9 x 23.2, 27.2 x 21.6, 25.5 x 20, 24 x 18.3, 20.6 x 14.9, 19 x 13.4, 17.4 x 11.7, 15.7 x 10, 14 x 8.4, 12.4 x 6.7, 10.7 x 5Square measurements in millimeters: 24.8, 23.2, 21.4, 19.65, 18, 16.3, 14.6, 12.9, 11, 9.3, 7.6, 5.9Circle measurements in millimeters: 27.4, 25.3, 23.1, 20.6, 18.4, 16.8, 14.9, 13.2, 11.4, 9.8, 8, 6.2Triangle measurement in millimeters: 30.7, 27.7, 24.8, 21.75, 18.7, 15.7, 12.8, 9.8, 6.8, 4.8