The Kwik-Korner Jig, originally created by Do It Yourself Granite, makes it possible to cut 45-degree angles into granite. This invention makes it possible for customers, even those with little experience, to install granite countertops on their own. Do It Yourself Granite offers the tool for only $40 together with an order of slab granite, making it possible for homeowners to make their dreams of a granite countertop come true even if working with budgetary constraints.