This belt tensioner idler kit is made from a combination of high-quality steel and thermoplastic materials, making it heat-resistant, corrosion-resistant, durable, and compatible with a variety of vehicle models, including Toyota models (2006-2011 FJ Cruiser, 2007-2017 Highlander/RAV4, 2008-2017 Venza, and 2010-2017 Sienna); and Lexus models (2008-2017 ES GS, 2010-2017 IS, 2014-2017 RC, and 2008-2017 RX). This belt tensioner idler kit has a maximum diameter of 2.76 inches (7 cm), and the replaceable part numbers are 16620-31031, 16620-31020, 16620-31021, 16620-3103, and 16620-31050. Please check the product's vehicle compatibility, size specifications, and part number before purchasing to ensure it is compatible with your vehicle.