Grinder with adjustable corners and non-slip underside and soft grip. Equipped with carbide and ceramic sharpening inserts. Suitable for knives with smooth or serrated blades. Use ‘Coarse’ for quick sharpening of blunt knives, ‘Serrated’ for sharpening serrated knives and ‘Fine’ (ceramic, 1000 grit) for finishing. The sharpening inserts are replaceable.