If i have to use a dremel tool to fix, then the quality is lacking. - VISM KeyMod Picatinny Rail

The best thing about these is the price. That's about where the positives end. They don't fit into a keymod rail without modifications. Granted, a Dremel tool and five minutes will fix the issue. They have raised circles on the back that are probably to lock them into the rail once tightened, however, the areas are too large. After filing these off, the rails sit flush, but I don't know how secure they are. If you aren't using your rifle for work, these are probably fine, but if your life depends on it, look at something else.