Sharpen all your tools and knives with this three-piece Diamond Whetstone sharpener set. As you sharpen, the perforated surface of each sharpener collects the metal shavings, keeping the surface of your blades clean for easy, safe sharpening. Best of all, this kit will last for many sharpenings! Sharpen tools and knives Perforated surface collects metal shavings Blue Sharpener: 180 grit Yellow Sharpener: 320 grit Red Sharpener: 600 grit Each measures 1" x 3" overall