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Exact fit dimension - Precision engineered with 1" inner diameter and 2" outer diameter for standard garage torsion brackets. Heavy load rating - Engineered to support up to 450 lbs dynamic load and tested for 35,000+ continuous door opening cycles. Galvanized steel housing - Hardened stamped steel case resists physical wear and deformation under heavy spring tension. Pre-greased ball track - Sealed internal ball race delivers whisper-quiet shaft rotation and smooth door lifting performance. Convenient two pack - Complete 2-piece set designed for dual-spring residential systems or standard replacement maintenance.