Applicationfor Tandem Axle Truck/ TrailersSpecification Length between bolts：57mm Condition: New Warranty: one year Warranty for any manufacture defect. Package Included: Just like the picture shows. Feature Thicker Shackles For Added Strength Bronze Bushings For More Durability Greasable Bolts For Less Maintenance For Tandem Axle Notice -Instruction is not included. Professional installation is recommended -Contact us please for whatever we can help