One set of 6 pieces gages, including 8-12.7mm(5/16"-1/2"), 12.7-19mm(1/2"-3/4"), 19-32mm(3/4"-1 1/4"), 32-54mm(1 1/4"-2 1/8"), 54-90mm(2 1/8"-3 1/2"), 90-150mm(3 1/2"-6")