Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 7/8-In. OD x 8-1/2-In. Extension Spring, 7/8-In. OD x 8-1/2-In. Request a Quote UPC: 38594003251 SKU: 681767 Model Number: C-325 7/8" OD, Extension Spring, 8-1/2" Length, .062" Wire Diameter, 23.9" Maximum Deflection, 9.37 LB Maximum Safe Load, Bulk With UPC.