The Nano-Hone NL-5 lapping plate is designed to flatten waterstones from 20μm to 0.5μm (400grit to 30,000grit). See chart
The NL-5 is a traditional plated design. However, unlike standard designs, the NL-5's surface is a series of raised diamond coated structures. It is the edges of these raised diamond structures that are doing the heavy work.
The NL-5 has a star and hexagon pattern maximizing the number of working edges. This increases the number of edge-material contact points.