Magic Grip Tool The Open-end wrench or spanner - This is a one-piece wrench that has u-molded openings. It holds two inverse screw or nut's sides. It is typically a two-finished instrument and one of its sides has an alternate estimated opening, from the other. Each end adjusts at a point of around fifteen degrees to the longitudinal pivot of the handle. This plan permits a greater scope of movement by hurling the wrench device over.