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Construction involves sizing 5/8" or 3/4" plywood for a snug fit in the window opening, then attaching barrel bolts every 18" or so, with at least one barrel bolt on each edge. Finally, the locations of the barrel bolts are marked and 5/16" holes are drilled into the siding .
RBD-0905 5/16" Diameter Masonry Drill (Sold Separately)