Why we say graphite lifting appliance is better than metal one?

Though metal hook is durable and not easy to be damaged, thermal expansion of the metal hook could easily burst electrode socket when heated. Meanwhile, it is easy to damage the electrode thread when carrying and cause massive scraping which makes electrodes easy to loose. On the contrary, graphite lifting appliance have same thermal expansion property and hardness as the electrode, which will not happen the above poor situations. But the use of graphite lifting appliance period is short, and easy to be damaged. If found serious damage, it should be changed in time.