I used this stone to add the finishing touches on my 210mm Tojiro gyuto and wow is it sharp - it slices through red onions with zero effort. While this particular stone isn't the largest, it still does the job just fine for all my cutlery. Take note of your sharpening angle; too steep and you'll end up cutting into the stone itself, which is fairly soft to begin with.
Beginning on the right side of the knife, move from tip to heel and heel to tip, then flip the knife and repeat. For the left side, it’s opposite—start at the top of the stone to reach the heel area completely. So, you will move from heel to tip and then tip to heel. Remember to apply and release pressure as you did earlier, exactly the same as in Step 2, but with light, refining pressure.