Flexibility in the design is the key in the metal stools when compared to the wooden and plastic type.
Numerous ways of connecting links for various purposes could be attached to the metal stools with great ease.
It could be the wheels at the bottom of the stool, or the link or lever to adjust the height of the stool accordingly.
Sometimes it could be the links and fixtures for varying the size of the stool as well as the flips to make it easily portable and rest them in remote places to not to occupy space.
All these advantages of the metal stool are confined exclusively for this variety alone and not possible to be made in a purely wooden or plastic stool.
The metal stools used in the bars are most common ones.
In general they are quite robust and relied upon for serious industrial applications where in a plastic or a wooden one cannot fit in the purpose.
But in that case the material of the stool is taken into consideration keenly.
It has to be highly resistant to the corrosive atmosphere as well as the wear and tear caused due to harsh weather conditions.
For this special type of material are used such as the brass and pure steel ones which are outstanding in their abilities to fit into the above criterion.
Insulating material is coated on the top surface of these sorts of metal stools so as to prevent accidents due to fire and electricity.
Also corrosion resistant coatings are also done on top of the insulation for longer life and durability of the metal stools of such applications.
Nickel stools are used in the aircraft industry for special purposes and also essentially in the workshops.
The main advantage in using this material is to possess extremely light weight and maximum durability.
While it has the natural characteristic of resistance to corrosion and electricity and also to fire to a certain extent, it is bit costlier to be used for ordinary applications.
There are stools made with the lighter metals also.
These are aluminum stools.
Some are made up of cobalt too.