Grey Plier in dreams
A gripping tool — extending your hold on something slippery or hot to handle.
How grey changes the reading
Grey colour layers ambiguity onto the symbol. The base meaning is still there, but the dream is saying you do not yet have the colour information — the situation has not declared itself.
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.