These extra coarse diamond hones work with the V-Sharp Classic I Diamond Sharpener from Warthog Sharpeners. They have a 270 diamond grit that is ideal for sharpening kitchen, pocket, and hunting knives. It leaves a toothy, micro-fine serration that is perfect for cutting through vegetables or meats. Item comes with two diamond honers that feature an easy slide on design. These extra coarse sharpening stones are an essential for a complete blade sharpening system.