Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 13/16-In. OD x 4-1/2-In., 2-Pack Extension Springs, 13/16-In. OD x 4-1/2-In., 2-Pack Request a Quote UPC: 38594002575 SKU: 681502 Model Number: C-257 2 Pack, 13/16" OD, Extension Spring, 4-1/2" Length, .091" Wire Diameter, 3.2" Maximum Deflection, 29.0 LB Maximum Safe Load, Polybag.