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Professional Garage Door Torsion Spring Assembly with Stable Balance and Smooth Operation. High tensile spring wire for stable lifting performance. Available in oil tempered and powder coated finishes. Rated for 15,000 operating cycles. Suitable for residential and commercial garage doors. Multiple inside diameters available from 1-3/4" to 6". Smooth winding and precise balance control. OEM and custom specifications supported. Optional PVC spring filler for reduced vibration and noise.