Trench shoring company manhole boxes provide four wall protection for the ultimate in worker safety. Specially built for manhole installations, tie-ins and repair work, manhole boxes provide the flexibility you need with the protection requires. Manhole boxes are available in 4’, 6’ and 8’ heights and come either 8’ or 10’ square. Manhole boxes are available with solid sides or cut outs at the bottom. Specially built for manhole installations, tie-ins and repair work. Manhole boxes can be stacked in combination with flex-shield boxes for unique applications.