These 20 inch Double Eye Leaf Springs have 3 Leafs and are rated to 1,850 lbs. each. This would bring a pair of these 20 inch DE Trailer Leaf Springs to 3,700 lb capacity. These are commonly paired to 3,500 lb. trailer axles. The spring is 1 3/4" wide, and 20 1/8" from center eye to center eye. It's called a 20" because it is meant to fit into spring hangers that are 20" apart. If your springs measure slightly longer than 20" that is normal, springs can flatten out over time and measure slightly longer than they did when they were new. To get a more accurate measurement you will want to measure the distance between your hangers from center to center.