The Hand Knife Sharpener Global Water Sander G-91 is safe and easy to use. It is designed to sharpen your kitchen knives professionally with minimal pressure, yet also easily. The hand grinder has two ceramic rollers and requires only a few simple strokes (depending on the residual sharpness) to keep your high-quality knife blades sharp. Series: Global Item number: 1712 Colour: Black, Metal Note: Not suitable for dishwashers