“Behold it is cast into the fire for fuel. The fire has devoured both the ends of it, and the middle of it is burned. Is it profitable for any work?”
In fact its only other use is as fuel, and it is not even very good for that. It is quickly consumed, both ends and middle. And what other profit has it? None. This is then again emphasised. The comparison of both ends with the middle is explained in Ezekiel 15:7. That which is burned at both ends represents those slain in the invasion of Jerusalem. The middle which is also burned represents those who escape, only to face further judgment.