[header] How to bolt down a gun safe [title] Locate the anchor hole. [step] Most medium and large gun safes are made with an anchor hole in the bottom. Fireproof gun safes often place holes at the center; traditional gun safes tend to put anchor holes in the corners. 
[substeps] A lag screw or cement bolt passes through the hole in the gun safe to sturdily connect it to cement underneath. Smaller gun safes may have anchor holes on the back or sides of the gun safe.