2-3/8" axle tube 3.5K. 2 per pack. For Cargo, Travel Trailers and 5th Wheels built without suspension shocks. This easy do-it yourself kit contains: 2-HD Gas Shocks, 2-Bolt On Shock Mounts, U-Bolts, Nuts, Tie Plates, Installation instructions. This affordable kit will dramatically improve your ride, reducing road shock and vibrations.