Dia Compe Starnut 1 1/8Steel star fangled nuts for anchoring headset compression in steerer tube.
There isn't a huge diversity of starnuts in my opinion. There are flimsy ones, normal ones, and heavy duty ones. This falls in the "normal" category. I've stripped the threads out of one of these Dia Compe starnuts before so I recommend using a setting tool. Solid once you get it in there.