Apparatus for visually indicating a loose wheel nut on a motor vehicle has a first ring for engaging a first wheel nut so as to be rotatable therewith and a second ring for engaging a second wheel nut adjacent to the first wheel nut so as to be rotatable therewith. The first ring has a first pointer for indicating a start position of the first ring, and the second ring has a second pointer for indicating a start position of the second ring. A resiliently flexible elongate member interconnects the first and second rings. The elongate member is configured to curve in at least two directions and has a first end portion connected to the first ring and an opposed second end portion connected to the second ring. In use, any loosening rotation of the first wheel nut will cause the first ring and is pointer to rotate therewith, thereby providing a visual indication of a loosening of the first wheel nut.