This handy Jump Ring Maker Mandrel is perfect for making jump rings on the go. Two mandrels are included - the larger size will make jump rings in sizes 6.0mm, 7.3mm, 8.2mm, 9.0mm, and 10.0mm. The smaller tool makes sizes 1-1/2mm, 2.0mm, 3.0mm, 4.0mm, and 5.0mm. 5-1/2-Inch (14cm).