Adjustable Parallel Pair, Included Sizes 1 3/4 in to 2 1/4 in, 44 mm to 57 mm, Maximum Size - Inch 2 1/4 in, Maximum Size - mm 57 mm, Minimum Size - Inch 1 3/4 in, Minimum Size - mm 44 mm, Number of Pairs 1, Range - Inch 1 3/4 in to 2 1/4 in, Range (mm) 44 to 57 mm, Thickness 9/32 in, Includes -, Includes Case No, Length 5 1/16 in, Parallelism +/-0.001 in, Tolerance -