Can you help me identify this odd fence-like brick? This brick was found in a selection of unopened LEGO bags left with an instruction book that were donated to my mother's workplace. Bags did not correspond to the book and and as such I am left at an impasse to find this brick as it is odd enough that I have been unable to find it so that my brother and I can obtain more of them.
You have part number 64448: Support 1 x 6 x 5 Girder Rectangular



I'm not sure what color your piece is, but here is a list of sets it comes in.