This OE spec pulley is manufactured by Litens Automotive, the inventor of the first automatic belt tensioner in 1979, and today the world's largest supplier of Original Equipment (O.E.) belt tensioning and routing products. This pulley conforms to original equipment material, tolerances, and specifications . Heavy duty polymer construction provides long life and trouble-free performance. Litens is the world's largest supplier of original equipment (O.E.) power transmission products. At Litens, we design systems that are more efficient, resulting in tangible fuel economy/emissions benefits. Litens holds over 2000 patents and continues to respond to the ever-changing automotive industry by investing heavily in new technology, facilities, and people. 90% of our line is made of products coming from the OE manufacturer, which makes the Litens Tensioning Products portfolio the purest OE tensioning line in the North American aftermarket.