I've got a 7" mora like that. The bottom section has a threaded insert that is welded into the top of the blue section. The top handle screws into the bottom section. I think in theory it is supposed to come apart and be a two piece hand auger. In practice the only way I have ever been able to take it apart again after using it is to clamp the bottom section in a bench vise and give the top section a good whack the heel of my hand in reverse to loosen it up.