Description:This Large expanding ring mandrel for lathe fits ring sizes 7 to 14 This set also includes an Allen wrench to expand and contract the mandrel. High quality steel material:Our expanding ring mandrels for ring making are made with carbon structural steel.it has higher strength, to deformation compared to ordinary steel. Easy of use: Its effortless to use this expanding mandrel for lathe. There is extra room on each ring size to accommodate tape to keep the inside of your rings scratch-free. For proper function, apply a layer or two of tape to the step you will be using. This helps protect the inside of your ring. Features:Spinning your ring on a lathe will make it 10x easier to make rings compared to using a rotary tool or other methods.you can easily swap out any size and have a snug fit within seconds. Precise:Expanding mandrel offers a high level of precision when making rings. Designed to be used in a lathe. Also fits in drill chuck.