1.Gauges:plain ring gauges 2.Material:GCr15 3.Type:Various types (Metric,UNC,UNF, ... ) 4.Precision:5H,6G,7H Metric plain ring gaugesFeatures: 1.Gauges:plain ring gauges2.Material:GCr153.Type:Various types (Metric,UNC ... ,please feel free to contact with us. Metric plain ring gauges