1Application:The ring bending tool is designed for working with soft precious metals, so we recommend this ring bending tool for soft metals, which must be 3mm or less thick. 2Nylon Mould: Our ring bending machine is equipped with nylon mould to avoid external forces to bend the material without damaging the delicate material. 3Metal Material: Ring bender tool is processed from sturdy steel and then hardened to 45?50 HRC. each steel post and die is black oxidized for a lifetime without corrosion. 4Multifunctional: Jewelry tool can be bending earrings, rings and other metal parts; suitable for home crafting, jewelry DIY, jewelry repair, jewelry design, or jewelry store. 5Easy to Use: Ring bender is one of the most commonly used jewelry making tools, you can easily get more accurate size and shape. With storage box, it is more convenient to use and store.