Using a rotary drill and a diamond drill bit, diamond drilling is a type of core drilling that produces precise holes. Since diamond is the world's hardest naturally occurring material, it may be used to make holes in a range of materials, including glass, metal, and concrete. Stitch drilling circumvents the constraints imposed by the maximum size of diamond drill bits by overlapping (or sewing) core holes together to form a bigger hole. This allows you to cut holes through...