For tiled walls use the smallest or medium screw size. Uno™ Universal Plug. Plug that fixes most light to medium weight objects to solid or cavity walls, ceilings or floors. Can be used in materials ranging from plywood to plasterboard, brickwork, blockwork, concrete and stone. Typical applications include shelf fixings and wall mounted cabinets. Expands into wall immediately for secure grip in plasterboard Cannot be over-tightened Anti-rotation fins prevent spinning in the hole Universal application saves searching for right plug for every wall type