Shipping Container Jack Lug Leveling Attachment is what you need when your storage container is not level with the ground. Just insert the jack lug head into the bottom of the corner casting of the container and then turn it upside down. Use a hydraulic bottle jack (sold seperatly) to raise the container off the ground. you raise your container to the leveled height you will then place shims or wood under your container to make it completely level. Description: Condition：New Color:Black Material：High Steel Carbon Min. Proof Load: 51,500 PSI Tensile Strength: 74,000 lbs Ground Clearance: 10" .