The 4" by 1" by 1/2" size is perfect for storing in your tool box, tackle box, or glove box. The stones are available in Fine, Medium and Coarse grits. We also sell the 3 stones as a set. The 3 stones provide the ability to quickly establish an edge with the coarse stone, refine the edge with the medium stone, and then finish your sharpening with the fine stone. These stones feature Norton's India (aluminum oxide) abrasive material. Made by Norton Abrasives.
Fine: Norton Item No. FB24, Part No. 61463685585
Medium: Norton Item No. MB24, Part No. 61463685590
Coarse: Norton Item No. CB24, Part No. 61463685595