General description Impact quality tamperproof Star* 1/2" D socket bit designed specifically for pulley fixings on Mercedes-Benz M271 1.8L engines. This tool is equivalent to the Mercedes Benz OE tool number 271 589 00 10 00. Technical specifications Size: T100 tamperproof Drive: 1/2" D Length: 78 mm Material: Chrome Molybdenum steel Finish: Black Phosphatised