Product Information We offer a choice of choosing between GO and NO-GO both made in Tungsten CarbideSteel and GO in Tungsten Carbide with NO-GO in Steel. The latter type is more popular owing to the cost advantage. We also manufacture Plain Plug Gauges to relevant I.S., B.S. and DIN standards based on customer requests from 1- 400mm diameter. We are also specialize in non-standard designs such as extra lengths, multiple diameters, air grooves, pilots, depth steps and relieved NO-GO ends.