This is an attachment specifically designed for use with the Veritas Mk.II Honing Guide. When planing on large, flat surfaces, it is often desirable to hone a slight curve, or camber, into the edge of the blade. The Veritas Camber Roller Assembly has a barrel-shaped roller that allows limited rocking, whilst still maintaining an accurate and consistent bevel angle. Simply replace the standard roller assembly with the camber assembly and sharpen. The blade is still set using the registration jig, and the camber roller includes the standard eccentric system allowing micro-bevels to be honed.