With Precision Test Bars, users can confirm that machine spindle is running accurately. Each test bar is provided with certificate of accuracy that spells out bar diameter and gage length that is inspected and certified to 4 decimal places. Expanded test bar offering includes CAT40 and CAT50 models; BT30, BT40 and BT50 models; and HSK50A, HSK63A, HSK80A, and HSK100A models. Bars are supplied in protective wooden boxes with handles, hinges, and clasps.