ZENOAH KOMATSU RED MAX chainsaw clutch bell pinion Bell: 68.00 mm Shank: 15.00 mm Height: 26.20 mm Pitch: .325 Number of teeth: 7 for models: G400AVS G410AVS G450AVS G455AVS G500AVS Part No.: 001778 Original part No.: Z288051110 ZENOAH KOMATSU RED MAX SR