Feature 1Heat Treatment: Made of heat treated steel, the bolts have a strong oxide film on the surface, which enhances their anti wear and erosion quality and prolongs their service life. 2High Strength: Bolts with 18 threads per inch, deep and clear. Heat treated bolt has a higher strength and hardness, anti tensile and torsion, not easy to deform or break under high loads. 3Application: These trailer leaf spring shackle bolts are used to fix your leaf springs to the leaf spring hangers and also to the center equalizer bar of the trailer. 4Wide Compatibility: The leaf spring shackle bolt set is suitable for use with trailers that have 2,000lb and 3,500lb axles, versatile use with wide compatibility. 5Package Include: You will receive 4pcs leaf spring shackle bolt with matching lock nuts, providing a complete solution for your trailer attachment needs. Item Type: Trailer Leaf Spring Shackle Bolts Material: Steel Fitment: Fits for installing 1-3/4in wide leaf spring and double eye leaf springs onto hanger bracket or equalizers. It is common on trailers that have a 2,000lb and 3,500lb axles. Package List 4 x Leaf Spring Shackle Bolts 4 x Nut