Why not? I always use magnetic tipped screwdrivers when working on PC's, and have never had an issue caused by them.
In my patch panel we use veritcal cable managers from middle atlantic. The rear ones are also cable managers from middle atlantic. They are off-set bars actually. Good for relay racks. I use regular bars (not off-set) in 4 post racks.
Horizontal Lacer Bars
We use LBP-1A and LBP-2A
Your looking at $43 for a 10 pack of the regulars and $72.88 for the 2" offset.
Thats what i charge anyway, you may find lower prices online.