Tool Grinding Attachment for the Ken Onion Edition, belts. Work Sharp has a mission to “introduce game-changing knife sharpening systems- knife sharpeners you will actually use.” That is exactly what Work Sharp has done. Your knives will cut like they are brand new every time after using their system. They are dedicated to quality products and excellent customer service. This Tool Grinding Attachment for the Ken Onion Edition includes the attachment piece and 2 abrasive belts (P60).