Craig Frames B221 12x36-Inch Mat, Single Opening for 5x30-Inch Image, Black with Cream Core

take a look at this mat which includes a V groove this mat has a three inch border with a V groove positioned at two and a half inches from the outside edge leaving it one half inch from the opening first step is to cut an opening in the mad at the point where we want our v-groove in this case I'll set my Mac cutter to produce an opening with a two and a half inch border I'm using a black core mat for this demonstration I think black core mats look especially good with a V groove but don't be afraid to place a V groove into a light colored mat that has a light core the subtle elegance it provides can be very pleasing to the eye and in custom framing elegant and understated is always better than overpowering and obnoxious after I set the guide bar and production stops there's one more thing I want to do I want to draw a reference line on the back of the mat I do this because I'll be rein