I just bought an open-end spanner and at the same time I was looking for those silly metal clips that look kinda-like a closed question-mark ( You know the ones ) so the head of the spanner sits in it, and all you have to do to get it is push the little arm in and open it. Does anyone know where to get these little things and more importantly, does anyone know what they're called so I don't look like an idiot when asking people on the phone. 