Please check the load rating to ensure that the correct leaf spring is selected. Specifications: 4 leaves; Eye to eye length: 25-1/4" ; Free open: 3" ; Width of leaf: 1-3/4" ; Bushing dia: 9/16" ; Leaf thickness: 5/16"Fitment Fits for: SW4B; 1750 lb capacity per spring for 3500 lbs trailers.Material: 60Si2Mn What you get:2 x Trailer leaf springs4 x 5-1/2" long U bolts. U bolts dia. 1/2"2 x tie plates for 1-3/4" leaf springs8 x 1/2"-20 hex nuts. Magorfas Trailer Leaf Springs are well-selected and tested.To ensure that it can withstand the load impact of the wheel on the frame, reduce the severe vibration of the body, and maintain the stability of the vehicle and its adaptability to different road conditions.