Asimeto Ring Thread Gauge (NoGo) - Metric - Right Hand - 6g - M56 x 1.5The Asimeto Ring Thread Gauge (NoGo) in metric size M56 x 1. 5 is a precision tool designed for machinists and quality teams who require strict 6g tolerance verification of external threads. Built for reliability, this gauge helps ensure only properly sized fasteners are used, promoting safe, consistent assemblies. 6g Metric Ring Gauge: Precisely tuned to the 6g tolerance class for measuring the thread pitch diameter on external threads (M56 x 1. 5).