Product Info Catalog Hardware Builders Hardware Springs 7/16-Inch OD x 2-1/2-Inch-Long Extension Spring, 2-Pack 7/16-Inch OD x 2-1/2-Inch-Long Extension Spring, 2-Pack Request a Quote UPC: 38594001318 SKU: 681130 Model Number: C-131 2 Pack, 7/16" OD, Extension Spring, 2-1/2" Length, .028" Wire Diameter, 13.2" Maximum Deflection, 2.64 LB Maximum Safe Load, Polybag.