Lansky Sharpeners Tri -Benchstone. This innovative sharpening tool harnesses the best of 3 impeccable materials: Diamond Alumina-Oxide and Ceramic. The Lansky Tri-Benchstone Sharpener sports a full Diamond surface that is the fastest way to reset an edge. The long lasting Alumina-Oxide and Ceramic surfaces are used for sharpening and finishing. The result is a stand alone sharpening center that will do it all with better versatility than other similar products and last longer doing it. All sharpening surfaces measure2" x 6". The sturdy plastic base boasts a wide footprint with low-profile and non-slip rubber feet giving the Lansky Tri-Stone Benchstone Knife Sharpener greater stability. Screw holes included in base for easy bench mounting. Features of Lansky Sharpeners Tri-Benchstone Sharpener: Diamond Stone for Fast Reconditioning - 100 grit Alumina-Oxide Stone for Sharpening - 240 grit Ceramic Stone for Final Polishing - 1000 grit Package Contents: Lansky Sharpeners Tri-Benchstone Knife Sharpener The Tri-Stone Benchstone is the most versatile 3 Stone Sharpener available harnessing the best of 3 worlds: Diamond Alumina-Oxide and Ceramic. The full diamond surface is the fastest way to reset an edge. The long lasting Alumina-Oxide and Ceramic surfaces are used for sharpening and finishing. The result is a standalone sharpening center that will do it all with better versatility than other similar products and last longer doing it. All sharpening surfaces measure 2 x 6. The sturdy plastic base boasts a wide footprint with low-profile and non-slip rubber feet giving the Lansky Tri-Stone Benchstone greater stability resulting in greater user satisfaction. Screw holes included in base for easy bench mounting.