Cylindrical Reversible Pin Type Gauges: Used for gaging the diameter of rod or internal hole size. Tolerance:H7,h7,x, ... ,z... Cylindrical Reversible Pin Type Gauges: Used for gaging the diameter of rod or internal hole size.Tolerance:H7,h7,x ... ,y,z... Size: 0.5mm to 20mm, or 0.03" to 1.51", or customer sized.Quality tools, best ...