JBO M18 x 2.5mm Metric Coarse Go/No-Go Thread Plug Gauge 6H Metric ISO - 511820
Premium German made Metric Coarse Right Hand Go/No-Go Thread Plug Gauge. For checking to a 6H tolerance. (Please note, gauges under M0.9 are 4H tolerance and M1-M1.4 are 5H tolerance) .