Asimeto Plug Thread Gauge (D/E) - Metric - Right Hand - 6H - M25 x 1.5The Asimeto 682 Series Plug Gauge (D E) is a precision metric internal thread gauge designed for machinists, quality inspectors, and manufacturing technicians who verify M25 x 1. 5 threads. Built to conform to the 6H tolerance class, this gauge provides reliable pitch diameter measurements and quick go no go checks on metric fasteners. Series and standard: 682 Series plug gauge engineered to meet 6H tolerance for metric internal threads. Thread