This polishing stone is worth buying. Using this stone along with a 6000 or 8000 grit stone will make your knives very sharp!
Pros
REAL STONE FOR HIGH HRC WHEEL: Even hardened steel materials that are difficult to sharpen with a conventional artificial whetstone can be reliably sharpened. It also supports high Rc stainless steel (such as VG-10, VG-MAX, HSS, etc.) and high HRC Japanese carbon steel (such as Hitachi White Steel #1 #2, Blue Steel #1 #2, Blue Steel Super). etc.) Materials for a professional cook, carpenter and gardener.