Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 3/8-In. OD x 5-1/2-In., 2-Pack Extension Springs, 3/8-In. OD x 5-1/2-In., 2-Pack Request a Quote UPC: 38594002810 SKU: 639773 Model Number: C-281 2 Pack, 3/8' OD x 5-1/2" Extension Spring, .062 Wire Diameter, 1.6" Maximum Deflection, 20.6 LB Maximum Safe Load, Polybag.