gauge tools 1.ZG130-320 Multi-ring Tool Gauge 2.ZG150-320 ... Tool Gauge 3.ZG300-550 Three-point Tool Gauge gauge tools Type Three-point Gauge or Multi-ring Tool Gauges are ... joint, drill collar, drill pipe, fishing tool, and other relevant tools with different O.D. or inclusive O.D.ZG130-320 ... measuring range of it is from 300mm to 550mm. gauge tools