Invisible shelf holder is destined for mounting wooden or plate shelves. Holder diameter 10 mmm. For assembly, we drill in the wall, then attach the holder with a hex wrench that expands the peg in the wall. At the end, we assume the shelf on the previously screwed arms. Invisible arm is a steel mandrel embedded in a plastic housing. The load capacity of arms is 30 kg, assuming a spacing of 600 mm and a shelf depth of max. 200 mm.