Waterstones are synthetic stones designed to be softer than oil stones. These softer grade stones are used with water as the lubricant (versus oil) to develop a fast cutting slurry. The Norton Waterstone system was designed in a carefully planned sequence to create sharpening efficiency. You get the level of abrasiveness you need at each stage, without wasting time trying to sharpen your tools on a grit that is too fine, too soon.
The stones we offer here are all 8" (200mm) x 3" (75mm) x 1" (25mm) and are suitable for sharpening chisels, plane blades, kitchen knifes, cut throat razors etc.
The stones should be immersed in water (except for the 8000 stone which can be used with a splash of water). The flattening plate is a good additional purchase so you keep your stones flat.
Have a look as this Youtube Video to see how the Dia-Flat Lapping Plate copes with flattening waterstones.