Genuine Porsche Tool! Made in Germany. This tool is needed for holding the alternator from rotating during replacement of the fan belt. Porsche Type 911 , year 1975 and up. We are the North Jersey German cars specialists, dedicated to providing our customers with highest quality, OEM tools and parts for BMW, AUDI, VW, Porsche and other European cars.   We strive to provide the best customer service possible, no excuses.  Have any questions? Feel free to call us or message us(we respond lightning fast!)