Unik Gauges and Tools supplies Thread & Plain Ring Gauges. Unik Gauges and Tools is an ISO 9001:2008 registered company. Unik Gauges and Tools is the manufacturer of thread plug, thread ring, plain plug, plain ring, snap gauges & special gauges. Thread & Plain Ring Gauges has been available in parallel and taper types. Thread & Plain Ring Gauges has been provided in the wide range of 3 to 150 mm. These gauges are made out of Tungsten based oil-hardened non- shrinking steel [OHNS] duly tested for uniform microstructure and hardness.