Expand your size effortlessly with our (2-pack) sizer and 25mm rubber set. cast iron, the sizer can resize rings up to 15mm wide while the rubber is perfect for repairing and shaping metal. Great for jewelry makers, enthusiasts, and anyone who wants to resize their rings at home without the hassle of going to a jeweler. Perfect for use at home or in a professional setting, such as jewelry stores or repair shop. Our tools will save you time and money, while ensuring a for all your favorite rings.