... o-ring gauge. 4. AS568, BS, JIS, metric sizes all available. Description of Good Performance O-ring Gauge Conform to ROHS:1. Materials: can be NR o-ring gauge ... 2. Characteristics: good physical and chemical properties o-ring gauge. 3. Hardness: 30~90 shore A ... KTW, WRAS, LFGB, etc. 8. Applications: automobile o-ring gauge, electrical appliance, mechanical, industrial, construction, household, medical ...