This material is a synthetic resin; as well as equipment. To avoid breaking the mounting screws, finger tighten each one on the back of each number. Draw a solid, even line on the surface where the numbers will be. Enter the distance you want. Place a lipstick on each end of the screw attached to the back of the number. Align each number with the top of the line, then press the screws against the surface to transfer the lipstick (pattern). Then, use a drill bit the same diameter as the screw to drill through the surface. Use epoxy to fill the hole or 100% silicone, then immediately install each digit in its place. It worked so well for me that I just had to help others. This mounting screw is also sold in hardware or hardware stores in metal, but I would set the numbers that way anyway.
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