Based on their functionality, they are divided into two groups:
Elements with ∞ degrees of freedom: Shackles, stirrups and eye bolts.
Elements with 2 degrees of freedom (horizontal and vertical): hinges, fixing boxes and handles.
As for the materials, they can be forged pieces of alloy steel for quenching and tempering or pieces made from laminated steel.
The fittings can be manufactured in stainless steel, suitable for very corrosive environments, and in high resilience steel, suitable for installations exposed to extremely low temperatures.