Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 5/8-In. OD x 6-1/2-In., 2-Pack Extension Springs, 5/8-In. OD x 6-1/2-In., 2-Pack Request a Quote UPC: 38594002438 SKU: 681478 Model Number: C-243 2 Pack, 5/8" OD, Extension Spring, 6-1/2" Length, .054" Wire Diameter, 11.9" Maximum Deflection, 8.64 LB Maximum Safe Load, Polybag.