XIANQI Scope of Application: Black roller chain tensioner, 8mm for motorized tunnel motorcycles. High-quality Materials: Made of hard rubber and iron, it has higher abrasion resistance, corrosion resistance, durability and long service life. Stable Performance: Professional manufacturing, high performance, make your vehicle work more efficiently. Manufacture according to standard specifications and strictly follow the factory quality control. Size: Dirtbike chain rollers with heavy-duty bearings can be used at any time. Inner diameter: 8 mm/0.31 inch. Outer diameter: 3.6 cm/1.42 inches. Perfect Replacement: Old equipment can be directly replaced, convenient and reliable to use, easy to assemble and disassemble. Product Quantity: 1 Piece Product color: black Product size: 26*35mm; 8mm