What kind of shelf is a set?
A group of the main frame refers to the two column piece (sub frame only one column piece), two beams, if the two shelf is two plates, if it is the three layer shelves is three pieces of plates, if it is the four layer shelves are four laminate plates etc..
Under normal circumstances, some angle steel made of light shelves, or home shelf, are generally fixed four pillars, five plywood. This is all a set, and generally do not have much with the board.And shelves in more cases, there will be a main sub frame, the main frame with the Deputy frame is only a difference column, the main frame has two columns, the only one column (column has two feet). It doesn't have to say which is the main frame, which is the subframe, and the two are interchangeable.
Shelves to set as a unit, usually refers to the angle steel shelf, there is no main sub frame of the points, and the general shelves are based on the group, there is a main sub frame, a group of shelves refers to a group of main frame or a set of sub frame
