Stop your water stone sliding all over the bench. This one is made in Taiwan of #304 stainless steel (not chrome-plated) and has three non-slip rubber feet for extra purchase on the bench. Designed so you can suspend your stone in a water bath when not in use. Will hold stones of any width, and thickness, and any length between 180 - 230mm.
Shown here holding the popular double-sided King Bench Waterstone which is not included.