This adaptor expands the blade-holding capacity of the Veritas Mk.II Honing Guide to allow consistent, accurate honing of mortice chisels. It is compatible with both the standard and narrow-blade clamping heads. The Veritas Mortice Chisel Adaptor fits between the roller base and the blade clamping head of the honing guide. By increasing the height of blade carrier above the roller base, it allows you to sharpen the thicker blades of mortice chisels. With the adaptor in place you can sharpen chisels up to 17.5mm(11/16") thick and achieve a bevel angle in the 30° to 35° range required for mortice chisels. Made in Canada.