BEADALON-Jump Ring Mandrel. A tool perfect for making jump rings on the go. This package contains two mandrels: the larger size will make jump rings in sizes 6.0mm, 7.3mm, 8.2mm, 9.0mm, and 10.0mm and the smaller one will make sizes 1.5mm, 2.0mm, 3.0mm, 4.0mm, and 5.0mm). Each tool features a no-slip grip and measures approximately 5-1/2in long. Jump rings not included. Imported.