Intellistage IS-ISBD Backdrop T-BarsFEATURES Designed to work with existing guard rails, our backdrops install easily onto our standard Intellistage 4 x 4 guard rail panels. Backdrops are sold in modular 4 foot sections allowing design flexibility to fit nearly any size stage. One backdrop section consists of a 4 wide metal T bar that installs on top of an existing guard rail. Once installed, the T bar telescopes out and is adjustable in height from 5 to 12 high depending on your needs.