Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 3/4-In. OD x 3-3/4-In., 2-Pack Extension Springs, 3/4-In. OD x 3-3/4-In., 2-Pack Request a Quote UPC: 38594001912 SKU: 681346 Model Number: C-191 2 Pack, 3/4" OD, Extension Spring, 3-3/4" Length, .105" Wire Diameter, 1.39" Maximum Deflection, 46.2 LB Maximum Safe Load, Polybag.