Aftermarket Minis 51t Sprocket and Chain Guide Lowering Block PackageAftermarket Minis KTM, Gas Gas, Husqvarna E3, E5 chain guide extender kit will drop the chain guide down about 2". This is used when going to a larger size sprocket to give your larger sprocket more room and to direct your chain into the guide correctly. We recommend using this when going to a sprocket larger than a 48 tooth. Needing a 51 tooth rear sprocket? Also available from our website Kit Includes Anodized billet aluminum extender and mounting