Review on Precision Sharpening System: Professional Grindstone for Angle-Specific Blade Restoration by Adam Jenkins

You really need to get to the finer grits to get truly razor sharp edges. With them I used the Riuxan Pro mount and the 15 degree angle - I was able to shave the hair off my arm (carefully) - really sharp! The first batch arrived broken but was taken to the nearest health food store (no packaging or shipping required) and quickly received an undamaged replacement.