Overall Review: Put these rails on a Rosewill RSV-R4000U 4U Server Chassis, with two people it was a breeze to set up and rack, 0 issues for me.

Pros: (edit)-best case I've ever built in for me, aside from nicking my fingers here or there on some rough edges, it was a total breeze.

Cons: -1 screw for the top cover seems to have had its hole drilled slightly offset from the one on the Chassis itself, making the original screw stick out at an odd angle and not a perfect 90 -Initially tried to take off the handles to get the rail kit I purchased on (didn't need to and they fit after some effort) and one of the screws simply spun in place, don't know if I broke the screw head or stripped the chassis, but I can imagine that might be worrisome if someone was using the wings to mount it to a rack. (edit)-some sharp edges here and there.

Overall Review: Haven't had a chance to build in it, but aside from those two slight issues I had the things almost perfect. (edit)-have had the chance to do a build in it, my favorite case honestly, a little rough around the edges but for me it's just about perfect.