Businesses involved in the the following industries (as defined by the SIC Codes 2007) can use the ProQuin product as defined in the table below.
| Options |
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| 24 Manufacture of basic metals |  | | |
| 24.1 Manufacture of basic iron and steel and of ferro-alloys | | | |
| 24.10 Manufacture of basic iron and steel and of ferro-alloys | | | |
| 24.2 Manufacture of tubes, pipes, hollow profiles and related fittings, of steel | | | |
| 24.20 Manufacture of tubes, pipes, hollow profiles and related fittings, of steel | | | |
| 24.3 Manufacture of other products of first processing of steel | | | |
| 24.31 Cold drawing of bars | | | |
| 24.32 Cold rolling of narrow strip | | | |
| 24.33 Cold forming or folding | | | |
| 24.34 Cold drawing of wire | | | |
| 24.4 Manufacture of basic precious and other non-ferrous metals | | | |
| 24.41 Precious metals production | | | |
| 24.42 Aluminium production | | | |
| 24.43 Lead, zinc and tin production | | | |
| 24.44 Copper production | | | |
| 24.45 Other non-ferrous metal production | | | |
| 24.46 Processing of nuclear fuel | | | |
| 24.5 Casting of metals | | | |
| 24.51 Casting of iron | | | |
| 24.52 Casting of steel | | | |
| 24.53 Casting of light metals | | | |
| 24.54 Casting of other non-ferrous metals | | | |
| 25 Manufacture of fabricated metal products, except machinery and equipment | | | |
| 25.1 Manufacture of structural metal products | | | |
| 25.11 Manufacture of metal structures and parts of structures | | | |
| 25.12 Manufacture of doors and windows of metal | | | |
| 25.2 Manufacture of tanks, reservoirs and containers of metal | | | |
| 25.21 Manufacture of central heating radiators and boilers | | | |
| 25.29 Manufacture of other tanks, reservoirs and containers of metal | | | |
| 25.3 Manufacture of steam generators, except central heating hot water boilers | | | |
| 25.30 Manufacture of steam generators, except central heating hot water boilers | | | |
| 25.4 Manufacture of weapons and ammunition | | | |
| 25.40 Manufacture of weapons and ammunition | | | |
| 25.5 Forging, pressing, stamping and roll-forming of metal; powder metallurgy | | | |
| 25.50 Forging, pressing, stamping and roll-forming of metal; powder metallurgy | | | |
| 25.6 Treatment and coating of metals; machining | | | |
| 25.61 Treatment and coating of metals | | | |
| 25.62 Machining |  | | |
| 25.7 Manufacture of cutlery, tools and general hardware | | | |
| 25.71 Manufacture of cutlery | | | |
| 25.72 Manufacture of locks and hinges | | | |
| 25.73 Manufacture of tools | | | |
| 25.9 Manufacture of other fabricated metal products | | | |
| 25.91 Manufacture of steel drums and similar containers | | | |
| 25.92 Manufacture of light metal packaging | | | |
| 25.93 Manufacture of wire products, chain and springs | | | |
| 25.94 Manufacture of fasteners and screw machine products | | | |
| 25.99 Manufacture of other fabricated metal products n.e.c. | | | |
