The AccuSharp Precision Sharpening Kit allows you to manually sharpen your knives at a consistent, exact, fixed angle. This kit provides precision sharpening designed to maintain accurate results for your knifes specific edge. The AccuSharp Precision Sharpening Kit is equipped with six angle and five stone options to keep your knifes edge razor sharp. Knife clamp has settings for 11, 15, 19, 21, 25 and 30 degree angles.