Innovative Edge-Vision® design makes grinding and sharpening tools faster, easier and more precise. Slots in the wheel allow you to "see through" it so you can see the edge while you are sharpening. This wheel is for applying WS2000 specific Slotted Edge-Vision® PSA abrasives or standard 150mm solid abrasive disks. Double sided wheel allows you to place different grits on each side to expand your Work Sharp's abrasive selection. Also serves as a direct replacement. This is designed to fit the Work Sharp WS2000 model only.