Replacement Recliner Sofa Sectional Mechanism Tension Spring 4 1/2 inch. Spring has total length of 4 1/2 inches and outside diameter of 11/16 inch. The hooks measure 7/8 Inch above the coil. Spring has 30 coils and a coil length of 9/16 inch The hooks measure 7/8 inch above the coil. Contact customer service for additional information and bulk pricing.