Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 1-1/2-In. OD x 11-1/2-In. Extension Spring, 1-1/2-In. OD x 11-1/2-In. Request a Quote UPC: 38594003015 SKU: 681668 Model Number: C-301 1-1/2" OD, Extension Spring, 11-1/2" Length, .135" Wire Diameter, 14.9" Maximum Deflection, 47.9 LB Maximum Safe Load, Bulk With UPC.