Gas Engine ,26CC, 43CC, 49CC E Motor, 150W,180W,200W,250W,300W,350W,500W,600W,750W,800W,1000W Material Type: SteelItem Type: Sprockets Specifications: Please compare the specifications to ensure this item fits your application before placing an order!! Teeth 9 10 11 12 13 14 15 Fit Chain T8F T8F T8F T8F T8F T8F T8F Pitch (mm) 8 8 8 8 8 8 8 Hole shape oval oval oval oval oval oval oval Medium hole diameter D1(mm) 10 10 10 10 10 10 10 Medium hole small diameter D2(mm) 8.5 8.5 8.5 8.5 8.5 8.5 8.5 Thickness (mm) 4 4 4 4 4 4 4 Outer diameter (mm) 26.5 27.8 30.8 33.2 35.7 38.9 42