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Nternational quality system certification. Spec. Open length: 100mm-600mm 600mm-1200mm 1200mm-3000mm Pressure: 30n-500n 500-1000n 1000n-4000n Dia: 12/4 15/6 18/8 22/10 25/12 28/14 28/16 40/20 2)fast delivery time. 38cm*14cm*27cm Can be customized