Personally I always hated trying to use those holes in the backs of electronics to hang on the wall. I always scratch the crap out of the back trying to get the screw heads in the holes or the screws were always slightly off preventing it from hanging right.
So Netonix went a different route with all of our smaller switches. Instead we provide (2) "through" holes that allow you to simply hold the switch to the wall where you want it and then use (2) screws that travel through the switch into the wall taking the pain out of wall mounting.
Just to not crank it down so tight as to bend the chassis which I had one RMA'd for repair as they used a screw gun and forgot to set the clutch and crunched the chassis and cracked the fan.
WS-6-MINI
WS-8-150-AC
WS-8-150-DC
WS-10-250-AC
WS-12-250-AC
WS-12-250-DC
WS-12-400-AC
WS-26-400-AC
WS-26-400-IDC
WS-26-500-DC
WS-26-DC
WS-12-DC
If you would have searched the forums you would have found this post:
viewtopic.php?f=6&t=906&p=6878&hilit=+screw+wall+mount#p6878