Review on Lancher 20-Pack M6 x 16mm Rack Mount Screw and Cage Nut Set for Server Shelf Cabinets by Bobby Posner

Overall good set of cage nuts and bolts for rack mounting. The screws thread in easily and the Phillips slots are well formed and "deep enough" that a strong wrench doesn't help slipping when tightening - a whole box out of the box, no trouble threading. -1 star: Only downside is the "cage" around the nuts - not as much "spring action" as others I've used so they're easier to accidentally pop out of square post holes than others I've come across have used for many years. Not to say that many will, just that very few can pop out if the cage nut moves a little. I would still recommend them despite this minor issue Comes in a nice little cardboard box rather than a plastic bag which I think makes it a lot easier to use - easily accessible but they don't get thrown around everywhere.