In high impact polystyrene. Made of support plate of 4 mm of thickness, with 72 closed sockets to avoid leakages by the side of the wall and, therefore, any contamination risk. It is supplied with 72 pegs, to be inserted by pressing them, for tools with spread of more than15 mm. It does not rust or scale and is supplied with users instructions and hooks. For objects having a smaller diameter, such as test tubes and similar, special small pegs code 13810 are also available.