ToolUSA Toolusa Jeweler's Heavy Duty 12" Ring Mandrel & 15" Oval Bracelet Mandrel: KIT-TJ9763A Mandrel Is 12 Inches Long And Measures Ring Sizes From 1 To 15 Mandrel Is Made Of Hardened Steel That Protects It From Damage, Unlike The Ones Made Of Plastic Oval Shaped Bracelet Mandrel - 15" Tall - 3 X 2.74 Inches And Tapers To 1.5 X 1.25 Inches Both Tools Are Sturdy And Strong - Very High Quality - Will Last You A Very Long Time! A Perfection Combination For Any Jeweler - Use It To Shape And Repair Rings And Bracelets