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Firewall Hole PuncherDon't use a hole saw that is designed to cut wood. Instead, use a sheetmetal hole punch like this one from Greenlee. Select a size, drill the pilot hole, then tighten the bolt and let the cutter do the work. It's perfect for cutting a hole for a wiring harness to pass through the firewall. You can get these at any major tool store. View Related Article
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