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This leveling jack (also called screw jack) levels your scaffolding on uneven ground. The jacks fit on the inside of each frame leg allowing the height to be adjusted on each frame leg to account for uneven ground below the scaffolding. We sell our jacks in two sizes to fit all frame styles. Use the 1-1/4″ diameter tube for Waco, Bil-Jax or Baker/Perry scaffolding and the 1-3/8″ diameter for Safeway-style scaffolding.