The product is a vintage timing chain tensioner guide specifically designed for Yamaha TT500 and XT500 dual sport motorcycles from the years 1976 to 1981. It is an original equipment manufacturer (OEM) part with the OE/OEM part number 341-12241-03-00. This item is not universally fitting, making it a perfect replacement part for the mentioned Yamaha models, ensuring proper timing chain tension and performance for your motorcycle.