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Outer diameter: Phi 1 - phi 6mm Wall thickness: 0.25mm - 1.5mm Bearing pressure: 50 ~ 100Mpa Material: 304.304L.316.316L.317.321 Technical standard: Confirms to the GB/T3090 - 2,000 specifications. Application scope: Applicable for precision instrument, electronic appliance and automatic measuring appliance. Characteristic: small caliber and high precision.