Rough Plier in dreams
A gripping tool — extending your hold on something slippery or hot to handle.
How rough changes the reading
Rough texture adds friction — the symbol is real and useable but the surface of the situation has been worn. The dream is rarely critical; it is noting that the work of it has left marks.
The base reading of Plier
A plier in a dream is the dream's image of an extended grip — a way of holding what you cannot, or should not, hold with bare hands. The dream brings the tool when you are having to handle something difficult — a contested object, an unpleasant fact, a hot situation — at one remove. A plier closed firmly on its target is the dream telling you the grip is secure and the handling can begin. A plier that keeps slipping is the dream noting that even with the right tool you are not currently strong enough or careful enough to keep hold of the thing.