This new set of flat wide metal finger gauges accurately measures the size of fingers in American sizes. Each of the 29 finger gauges is clearly marked with its size in 1/2 size increments. Sizes range from US size 1 (12.37mm) to US size 15 (23.9mm) and come on a steel ring. Each gauge is 6 mm wide and very sturdy.  Wide Bands give a more accurate ring size preventing resizing issues due to twisting the narrower size gauges over the knuckles.