There is a constant need to manufacture special tools. Some of them are built on board the vessel without strength consideration. The tools like that are usually oversized just make sure that they will be strong enough. The big number of very good special tools are only available on a few vessels because the idea is not published even inside the same company. By designing the tools in 3D designing software you are saving money and time cutting down the test phase. The drawings can be easily distributed between the vessels or to the external workshop for manufacture. The 3D model of the tools can be distributed inside the office for approval where it can be seen from different sides.