Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 1-1/8-In. OD x 7-1/2-In. Extension Spring, 1-1/8-In. OD x 7-1/2-In. Request a Quote UPC: 38594002759 SKU: 681593 Model Number: C-275 1-1/8" OD, Extension Spring, 7-1/2" Length, .091" Wire Diameter, 13.2" Maximum Deflection, 21.3 LB Maximum Safe Load, Bulk With UPC.