Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 3/4-In. OD x 2-1/4-In., 2-Pack Extension Springs, 3/4-In. OD x 2-1/4-In., 2-Pack Request a Quote UPC: 38594001738 SKU: 681254 Model Number: C-173 2 Pack, 3/4" OD, Extension Spring, 2-1/4" Length, .105" Wire Diameter, .64" Maximum Deflection, 46.2 LB Maximum Safe Load, Polybag.