Product Description The Chain Guard for FC-M4050 and FC-M4000 Cranks by Shimano This Shimano chain guard fits the 40-tooth chainring of Alivio FC-M4050, FC-M4000, FC-MT500 and FC-M523 cranks. Four screws are supplied. Technical Information:Size:40 TBolt Circle Diameter:104 mmCompatibility:Alivio FC-M4050FC-M4000FC-M523FC-MT500-3Manufacturer Number:Y-1PY98080 Contents:1 x Shimano FC-M4000 chain guard4 x bolts Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com