The categories of work certified by Tomasino Metalzinco s.r.l. are listed below:
- general category OG 1 III bis (up to € 1.500,000) relating to civil and industrial buildings and in particular construction, maintenance or renovation of special buildings in concrete or prestressed concrete required to carry out direct or indirect human activities, including electromechanical, electrical, telephone and electronic installations and any related works;
- specialized category OS 18 A V (up to amounts of € 5.165,000) relating to steel structural components for both factory production and subsequent assembly;
- OS 28 I (up to € 258,000) for supply, assembly, maintenance or refurbishment of thermal and air conditioning systems.