Abstract: A routing template assembly has been devised which is specifically adaptable for routing out slots of different widths in panels, boards and the like, such as for example, in forming slots in side wall supports for insertion of shelf sections. The template is characterized by a slotting guide which is adjustable in width depending upon the width of slot to be formed, adjustment being accomplished by setting the spacing between spaced parallel guide edges of the slotting guide to correspond to the desired width of the slot plus the diameter of the router guide bushing less the diameter of the routing bit.