The Redi-Edge® Standard is our entry level sharpener which provides the same quality and consistency as our other products in a basic design.Tough. Dependable. Resilient. You won’t find another knife sharpener on the market that beats the Redi-Edge® RES150 for simplicity and effectiveness. The Redi-Edge® Standard’s has a black anodized aluminum handle for durability.The Redi-Edge® Standard’s Duromite™inserts are available with an inclusive angle of 30° or 40°. The Duromite™ inserts are harder than any knife blade and factory pre-set to inclusive angles of 30° and 40°. The 30° inclusive angle maintains a consistent 15° double cutting edge on your filet or boning knives. The 40° inclusive angle maintains a consistent 20° double edge on your knives. An inclusive angle of 40° is the most common angle for knives in the market today.