This handy Jumpring Making Mandrel is convenient way to make your own Jump rings. No more pencils, pens, crochet hooks and staff like that using as a mandrel! One Mandrel will make 6mm, 7mm, 8mm, 9mm, 10mm diameter jump rings. Alternatively you can use these Mandrels to make coils for wire-wrapping projects. Overall length of mandrel measures 14cm long. Made from stainless steel metal.