Adjustment range: 85.0 in. – 114.0 in. 51' sized used to restrain half loads; compact to fit in locked tool box. Useful in various load configurations through the universal design. Jack Bars feature 4" x 4" bolt-on feet assemblies and are designed for use in light- to medium-duty cargo applications. They feature 1-1/2" square heavy-gauge, galvanized steel tubing with a cycle tested, heavy-duty automotive jack assembly. All jack bars can be assembled with welded hoops or in 2- or 3-piece models. CAUTION: Because trailer sidewalls vary, the Cargo Sta® and Jack Bars load capacities are not available.