When setting the hinge cup, it is important to decide if the cabinet door is to have a profiled edge. If so then be sure that the router bit does not cut into the cups circumference. The hole drilled to set the hinge cup should be a flat-bottom hole drilled into the back of the cabinet door, and it is equally important to be certain that this drilling will not break through to the beveled edge of the door. The location and the depth of the hole will have some variance from brand to brand, but the diameter is generally 35mm.