: Steel jacks (roof jacks) used for sale, complete set. : Peace, mercy, and blessings of God be upon you, For sale: a quantity of used steel jacks (contracting roof jacks), in good structural condition and suitable for direct use in pouring and construction (the pin and thread are working and clean, as shown in the attached pictures of the jack). Condition: Clean used (free from significant dents). Sale: The entire quantity as a bulk lot (selling all together).