Metal bars for windows, also known as burglar bars, are available from hardware stores and major home improvement centers such as Lowe's and Home Depot. Ironwork businesses such as GlassEssential.com, WisconsinIronWorks.com, Morgik.com and GoodBarSecurity.com also create security grilles for windows.
Hardware stores and home improvement centers such as Lowe's and Home Depot offer a range of basic steel grilles, as well as swing-away bars hinged to allow for easy cleaning. These do-it-yourself options are installed by attaching the bars with long screws or bolts through window frames directly into a structure's framing and are meant for long-term use. Amazon and Menards.com also sell window security kits, as well as screws and brackets for installation.
Good Bar Security and Glass Essential supply removable bars designed for commercial use. These can be taken out of the windows while a store is open and replaced at closing time. Wisconsin Iron Works and Morgik Metal Design create decorative ironwork grilles, and also offer custom design services.
ACI Supply Company and Exit Technologies both produce burglar bars with a quick-release mechanism. These have buttons or handles, only accessible from the inside, that when pushed immediately release the window bars, creating a safety exit during a fire or other emergency.