SODIAL(R)Plastic Ring Gauge Mandrel Sizer Stick Tool US/UK Size---Black Material: Plastic Light weight and grooved on one side UK measures sizes from D to Z+5 1/2 in 1/2 size increments US measures sizes from 1 1/2 to 15 1/4 in 1/4 size increments Total Length(Approx.): 10 1/4 Inch (26cm)