Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 3/8-In. OD x 6-3/4-In. Extension Spring, 3/8-In. OD x 6-3/4-In. Request a Quote UPC: 38594002933 SKU: 681650 Model Number: C-293 3/8" OD, Extension Spring, 6-3/4" Length, .062" Wire Diameter, 2.05" Maximum Deflection, 20.7 LB Maximum Safe Load, Bulk With UPC.