THIS ITEM, WELL, I MUST BE HONEST, I DON'T KNOW EXACTLY WHAT THIS TOOL IS USED FOR. I BELIEVE IT IS USE TO CRIMP A SPECIFIC TYPE OF ELECTRONIC CONNECTOR. THE TOOL HAS NEVER BEEN USED. MY ORIGINAL INTENTION WAS TO RE-PURPOSE / MODIFY THE TOOL FOR ANOTHER PURPOSE. VERY SOLIDLY MADE HEAVY DUTY TOOL.