Plastic Ring Sizing Mandrel with 36 Sizing Rings - Measures U.S. Sizes 1-15 Yellow mandrel with easy-to-read black writing gives accurate results every time Two types of sizers give you a way to measure both the ring and the ring wearer's finger The mandrel shows both SAE (U.S. Standard) and metric (MM) sizing Mandrel is 10 inches long - Tools measure U.S. ring sizes 1-15 Sizers have 36 plastic rings on one lightweight aluminum ring to stay organized