Wusthof Combo Whetstone 3000 & 8000 Grit - 3069720303.
The WÜSTHOF Whetstone consists of a combination of different high-quality, abrasive grits. The stone has two sides – one with a fine grit and one coarse.
The coarse side is used to smooth off any unevenness while the finer grit is used to hone and sharpen your knife. Includes a non-slip holder for stability while sharpening.