Product Info Catalog Hardware Builders Hardware Springs 7/16-Inch OD x 1-1/2-Inch-Long Extension Spring, 2-Pack 7/16-Inch OD x 1-1/2-Inch-Long Extension Spring, 2-Pack Request a Quote UPC: 38594000335 SKU: 680975 Model Number: C-33 2 Pack, 7/16" OD, Extension Spring, 1-1/2" Length, .047" Wire Diameter, 1.71" Maximum Deflection, 11.5 LB Maximum Safe Load, Polybag.