ToolUSA Jeweler's Combination Hard Chrome Ring Mandrel And Dual Headed Nylon Hammer Hard Chrome Mandrel Is 11 1/2 Inches Long, And Measures Sizes 1-15 - Should Never Rust! The Mandrel Measures In Quarter Sizes, And Is Extra Tough To Do A Great Job The Wooden Handled Hammer Has Dual Nylon Heads That Won't Scratch Or Cause Sparks This Set Is Ideal For Sizing And Shaping Rings For Design And Repair Professional Quality Tools For Professional Looking Results