Product Name: No Go Limited Gages Pin Plain Ring Plug Gauge Model NO.: GB/T 3934 Customized: Customized Shape: Round Usage: For Inspection Certification: ISO, ANS, JIS Precision Gauge: Precision Gauge Material: Steel Test Methods: Through Check Method Measurement Object: Inside Diameter Type: Thread Plug Gauges Raw Material: Gcr15 Measuring Range: M1~M300 Accuracy: 0.001mm +-0.0005mm Hardness: Hra91 Tolerance: +/-0.001mm Trademark: Perfect Transport Package: Plastic Box +Inner Box+Carton Specification: GB/T 3934 Origin: Jiangsu China HS Code: 9017300000 Product Description Ring gauges used to check external thread. Plug gauges used to check internal thread GO & NOGO, RH(right hand) & LH(left hand) available