M2.5 X 0.45 H6 Go-Nogo Thread Plug Gage ~ Gages are “X” tolerance. ~ Most commonly used for general applications including bolts, nuts, screws and similar fasteners. ~ Comes with the handle. ~ Sold by the set. Comes with the handle. Gages are “X” tolerance. Most commonly used for general applications including bolts, nuts, screws and similar fasteners. Sold by the set.