Spyderco Tri-Angle Sharpmaker. Includes two fine and two medium grit triangle shaped ceramic stones which slide into precisely angled keyholes that are molded into a strong polymer base. 40 angle for sharpening, 30 angle for back beveling and 12.5 angle for sharpening scissors. Flip base over and two stones fit in to provide a bench sharpener. Includes two brass rods to protect users hands. All parts store inside base, and lid snaps on making a self contained unit. Includes instruction booklet and video.