Chef's Choice 4640900 4640 Angle Select Diamond Hone Manual Sharpener, Grey & Black, 10.3 x 2.2 x 7.2 inches Professional 3-Stage sharpener for incredibly sharp edges on Kitchen, Santoku, Sports and Pocket knives, 15' and 20'degree edges Sharpens both straight edge and serrated blades; 100% Diamond Plus commercial grade abrasives Combines inter-digitating diamond pads and conical disk technology; Crisscross technology: for an extremely sharp, long lasting edge with lots of "bite" Precise bevel angle control for 15' and 20' edges; Creates arch-shaped edges that last longer; Safe for quality knives Comfortable, ergonomic, ribbed handle for a secure grip; Slip resistant rubber feet hold fast to work surface; Designed, engineered and assembled in the U;S;A