Set Pietra Affilacoltelli Professionale Whetstone 4 Lati Grana 400/1000 3000/8000
All he needs for sharpening is water and the angle guide for the correct blade angle. Knife Sharpening Stone Kit – 400/1000 3000/8000 Grit Wet Kitchen Whetstone Knife Sharpener Set with Non-slip Bamboo Rubber Base, Angle Guide, Leather Strap.