The industrial diamonds used in the GoalFlow sharpener are the optimal material for restoring blades of any hardness to their optimal sharpness. The coarse diamond grinding wheel allows you to resharpen your knives effectively in the first step, achieving a precise grind. After the initial coarse sharpening, the stainless steel honing wheel gives the edge a fine finish, smoothing out the last burr on the cutting edge. Just a few forward and backward movements are needed to achieve the perfect result.