Easily overlooked when renewing hub bearings, this particular type fits onto a Citroen rear drum brake/hub assembly and can all to easily get damaged. Not readily available, this manufactures one is a direct replacement for the original, so no requirement to obtain a complete new assembly, and being German is of great quality. If you just have had a hub bearing replaced and now your ABS warning light has come on, then this could well be one reason why if damaged.