Shelf (storage)

Usually, two to six shelves make up a unit, each shelf being attached perpendicularly to the vertical or diagonal supports and positioned parallel one above the other.

The length of the shelf is based upon the space limitations of its siting and the amount of weight which it will be expected to hold.

Do it yourself (DIY) shelves can be made from things such as an old door,[4] colored pencils[5] or books.

[6] Additionally, shelves can also be 3D printed, allowing do it yourself (DIY) projects to have intricate detail.

It consists mainly of wood boards resting on black or galvanized steel gas pipe.

[7] Pipe shelving is mainly attached to a wall but some companies have designed free standing units.

But there are shelf systems where a brace is hung on the wall, onto which brackets are attached without screws.