This is a burnisher kit so you can make your own burnisher. The kit includes one 1/4” Unground Carbide rod 6” long and one Blue aluminum color .5” tall with 1 1/8” ID. the carbide rod has an exact size of .270” in diameter x 6.060” long and has a Rockwell hardness of 91.7. that is hard enough to turn a burr on any card scraper. plus with the unground texture, it will pull the steel out better making the sharpening proses faster and easier.
Here is a video demonstrating how I sharpen card scrapers with this burnisher.
https://www.youtube.com/watch?v=0zN1RSCxLNQ&t=327s
Here is the video showing making the burnisher
https://www.youtube.com/watch?v=8ZQWxK3TOcA