AccuSharp Knife Sharpener, 3 Stone Precision Sharpening Kit 060C The AccuSharp(R) 3-Stone Kit is equipped with six angle guides and three sharpening options to keep your knife's edge razor sharp with fine" medium" and coarse alumina-oxide stones. Angle guide has settings for 11 degree" 15 degree" 18 degree" 21 degree" 25 degree" and 30 degree angles.