Bench Wizard 12" Classic Ring Mandrel | Sizes 1-15 Marked with 1/4" Size Increments | Constructed in Solid Steel | Screw in Hole Built in | Smooth Finish & Ergonomic Textured Grip. VARITY OF SIZES: This 12 Inch ring mandrel features quarter sizes from 1 to 15, allowing for precise sizing of rings for a perfect fit. DURABLE MATERIAL: Made of high-quality, hardened steel, this mandrel is sturdy and long-lasting, able to withstand frequent use. SMOOTH SURFACE: The smooth surface of the mandrel has no grooves, making it easy to slide rings onto and off of, while also preventing damage to delicate jewelry. NON SLIP HANDLE WITH SCREW HOLE: This textured grip handle provides a comfortable and non-slip grip, ensuring precise control while working on delicate jewelry pieces. Has a screw hole on the bottom so that it can be screwed onto something and your hands are free to work with wire or a hammer. VERSATILE: The jewelers can use them for multi purposes like measuring, forming, sizing, wrapping, holding, shaping rings, and gold or silver jewelry repairing work, testing, beading, stretching also, for adults, men, women, and children who want to DIY their own real jewelry at home