User- features: includes hex wrench for effortless adjustments; designed for smooth and easy ring resizing operations Strong metal design: built to last with metal; maintains integrity during frequent usage and provides resizing performance solution: enhance your ring-making efficiency; suitable for professional jewelers and diy enthusiasts alike fit: easily adjust rings from 0.7 to 0.94 inches in diameter; ensures a smooth fitting experience and reduces resizing complications Professional quality: compatible with lathes; facilitates precise and hands-free expansion for jewelry professionals