Product Info Catalog Hardware Builders Hardware Springs Extension Springs, 3/8-In. OD x 3-3/4-In., 2-Pack Extension Springs, 3/8-In. OD x 3-3/4-In., 2-Pack Request a Quote UPC: 38594002155 SKU: 681387 Model Number: C-215 2 Pack, 3/8" OD, Extension Spring, 3-3/4" Length, .041" Wire Diameter, 3.88" Maximum Deflection, 6.52 LB Maximum Safe Load, Polybag.