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Use the Wire Worker Tool to create round, triangular, rectangular, and square shapes. Coil vivid Artistic Wires into colored Jump Rings to add definition and texture to jewelry designs, or use gold-filled, sterling, or base metal wire to fashion components that complement your designs. Make twisted Jump Rings for all your jewelry or craft projects. Easy to use, fast, and fun. There are 3 round mandrels with diameters of 3.5mm, 5mm and 6mm; one triangle mandrel that measures 7mm x 7mm x 7mm; one square mandrel that measures 6.2mm x 6.2mm; and one rectangle mandrel that measures 10mm x 2mm x 3.5mm