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Custom Length & Diameter Bolts for Spherical Tank & Pressure Vessel, 8.8-12.9 Grade, Find Details and Price about Sleeve Anchor Bolt Fin Neck Silo Bolt from Custom Length & Diameter Bolts for Spherical Tank & Pressure Vessel, 8.8-12.9 Grade - Ningbo Zhonglian Fastener Manufacture Co., Ltd.