40/28 μ (F 550) 17 mm: CBN-stone Apex Edge Pro, Ganzo Ruixin Pro, TSPROF Hapstone.

(🔥 🔥 🔥 ). F550 (40/28μ) 17mm: PDTools, CBN-stone Apex Edge Pro Ruixin TSPROF Ganzo. CBN (Cubic Boron Nitride) is the second-hardest material after diamond. H ello there,I have had a chance to use the stones on 2 knives.

eBay