Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 9/16-In. OD x 3-In., 2-Pack Extension Springs, 9/16-In. OD x 3-In., 2-Pack Request a Quote UPC: 38594001431 SKU: 681189 Model Number: C-143 2 Pack, 9/16" OD, Extension Spring, 3" Length, .054" Wire Diameter, 3.64" Maximum Deflection, 9.55 LB Maximum Safe Load, Polybag.