The KE-500 Sharpener features a patented, angle controlled cushion contact system, which produces razor sharp knives and polished edges in seconds.New features on KE-500:1. Angle Guides for knives with THIN edges(Angle Guide 1) and knives with THICK edges(Angle Guide 2). The knives sharpened by angle guide 1 is much better than that of any knives in the markets.2. Belt Covers reduce the possibility of cutting belt.3. Debris Trays- It is easy to pull out and clean the debris.4. Switch on the front of the machine prevents liquids or waters from flowing inside of the machine.5. Hand Screw on the upper cover makes it convenient to remove the upper cover.6. Metal Guards on the upper cover prevents the cover from being cut when knives are being sharpened.7. The entire knife from the heel to the bolster can be sharpened.8. Protecting irons inside of the upper cover and body prevent the plastic body from damage caused by the sparkles during sharpening. Sharpening carbon steel knives is also possible.9. Uses the same belts as KE-280 and KE-3000.