This accessory guide with barrel-shaped roller allows for honing slight curves into plane blade edges whilst still maintaining an accurate and consistent bevel angle. Simply replace the standard roller assembly of the Veritas sharpening system II by this camber assembly and apply gentle pressure to the sides of the blade when sharpening. Slightly cambered plane blades are particularly used on smoothing planes to avoid planing marks made by projective corners and to produce an even grain. Not suitable for scrub plane blades. Fits Veritas Mark 2  Sharpening System.