Wicked Edge Knife Sharpener - With Quartz Stone Base New Ball-Joint Guide Rod System Perfect Edge Every Time; Precise Angle Control; Easy to Use Adjustable Angles from 15- 30. Sharpens Knives up to 17" Upgraded Quartz Stone Base included (colors may vary) 8 Diamond Stones: 2 each of 100, 200, 400 & 600 grit. Complete Instructions included