This Work Sharp Replacement Abrasive Kit includes (4) sharpening disks for the E2 and E2P sharpeners. These long lasting, cool cutting engineered abrasives are a direct replacement for the discs included with the E2 or E2P. Each disc is 2 sided, doubling its life. Discs do not fit other Work Sharp products. Work Sharp abrasives are formulated, designed, and made in America by industry-leading abrasives manufacturer Norton for precision sharpening of high-strength steels. The grit symmetry, spacing, and backing flexibility are all designed to produce the optimal convex edge with minimal heating or material takeoff. If you’ve ever used a belt sander to sharpen, you know how quickly the steel heats and how much excess material can be removed if you aren’t careful. Our abrasives are a key component of our success in the sharpening world.