These are very cool.
They give the look of those high dollar quick change kits on one side (the tip) and look like traditional axle sliders on the back end.
Solid Delrin, the fit super snugly into the axle. I used a mallet to tap them in, and don't worry. They're not going anywhere. Those bad boys aren't coming out.
Very affordable and should do the job well, they stick out far enough. The HSBK race team has been running them for some years now. So you can trust that they're not garbage.