Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 13/16-In. OD x 4-In., 2-Pack Extension Springs, 13/16-In. OD x 4-In., 2-Pack Request a Quote UPC: 38594002599 SKU: 681510 Model Number: C-259 2 Pack, 13/16" OD, Extension Spring, 4" Length, .120" Wire Diameter .73" Maximum Deflection, 61.7 LB Maximum Safe Load, Polybag.