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When installing floor-anchored guard rails, you'll be required to drill holes into your concrete floor. For this you will need a drill with a masonry bit. Don't waste your time using anything else, as concrete can dull a titanium twist bit fairly quickly. The masonry bit was designed for the job. When you drill your bolt holes, make sure to use a bit roughly the same size as the anchor bolt, and be sure to drill holes as deep as the bolts are long for maximum effectiveness. When you have anchored the rail and completed the assembly, be sure to run through the entire guard rail from beginning to end to insure all the bolts are tight; you may need to adjust some of the first few bolts you installed.