Unik Gauges and Tools offer Thread & Plain Plug Gauges. Unik Gauges and Tools is an ISO 9001:2008 certified company. Unik Gauges and Tools is the manufacturer of thread plug, thread ring, plain plug, plain ring, snap gauges & special gauges. Thread & Plain Plug Gauges has been available in the range of 2 to 200 mm diameter. Thread & Plain Plug Gauges is used for parallel threads. This plug gauge is available in parallel and taper type. The taper diameter of this gauge is 1/8 inch to 8 inch for taper threads. It is available in different types.