Xblade, variable angle, 12.5° to 22.5° on each side
XBlade self adjusts to suit your knife. It is useful for all straight steel blades (not serrated), including high end chef knives where the angles are acute.
Classic & Pro, fixed angle, 20° on each side
The AnySharp is preset at 20°, which is the optimum angle for good quality European and American steel knives.