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Have metal shelves cut to size or buy pre-made shelves. The shelves must have corner holes through which the cables can pass. Because these shelves will be suspended from bolts driven into wall studs, shelf widths of 16" or 32" will make installation much easier.
Taking into account the location of the walls studs, determine the placement of the suspended shelving unit. Drive a pair of eyebolts into the wall studs near the top of the wall. These need to align with the outside edges of the shelving unit.
Thread one wire cable through each eyebolt, wrap it back around itself and secure it with a cable clamp. Make sure to leave enough room for the cables to extend past the lowest shelf.
Mark the desired height of the top shelf. Install two "L" brackets to the wall by driving screws into the studs. These brackets will support the back edge of the top shelf. Hold the top shelf on the brackets while threading the cables through the front corner holes. Make sure the shelf is level then secure the cable with cable clamps.
Attach two lengths of cable to the back corner holes of the top shelf using cable clamps. There are now four cables hanging down. String the four cables through the corner holes in the second shelf. Install a cable clamp underneath each corner, level the shelf, and secure with clamps.
Continue adding shelves in the same fashion until the shelving unit is complete. Cut off excess cable.