FIT:Compatible with Lifan 125cc 2020 Sinnis Terrain 50cc 70cc 90cc 110cc 125cc Dirt Pit Bike Mini Bike ATV 4 Wheeler Moped; SIZE:Front Sprocket 420 15 tooth 20mm;Spacing between the mounting holes:34mm/1.3″;Gear inner diameter:18mm/0.71″(As the picture shows) Material:High quality, stainless steel manufacturing, good corrosion resistance, heat resistance; NOTE:Please verify model number and size prior to ordering to ensure this is the correct part,420 represents the chain model, 15T is the number of gears, and the last is the size of the mounting hole, you can buy it on demand Package includes:a sprocket and two pairs of screw spacers