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Use a 2" wood bit to drill though the fire-resistant insulation. Do not attempt to drill through the steel safe body with the wood bit. 3 Use a ." high-speed bit designed for drilling metal to drill through the steel safe wall. Once you have drilled though the fire-resistant material and safe body, mark the center of your holes on the wall. 4 Remove the safe and use a 3/8" masonry bit to drill the anchor holes. Reposition the safe over the holes and install the expansion anchors and washers thro