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Ruler, spirit level, pencil, sealing compound, drilling device 4.5 mm (0.157 inches)
Lay out the stencils next to each other on an even surface and make sure the triangular shapes evolve into diamonds. Then connect all stencils with tape.
Mount the stencils to the wall. Balance them evenly with the water level and really stick them together. Mark the drill holes and remove the stencils. Do not drill through the stencils!
Use a 4.5 mm (0.157 inches) drilling device to drill a 50 mm (1.968 inches) deep hole (minimum) at each mark.
Screw the metal rods into the backside of the house numbers. Check the position on the wall once more before sealing the drill holes with a compound. Apply a little bit of sealing compound on the rods and slightly press them into the drill holes.
Clean the painted house numbers with commercially available stain remover.