TTC Sine Bar- Model: FSB-5 DISTANCE BETWEEN CENTER OF ROLLS: 5"(Sine Bars) ACCURACY: .0002" Width: 15/16" Flange on the end to rest work Measures angles accurately. Sine bar and rolls are hardened and ground for extreme accuracy. Parallelism: .00004". Center to center distance between center of rolls accurate within .0002". Top surface accuracy: .00003" per inch of length