Chain guard made of sturdy plastic for Shimano FC-M171 / FC-M311 square taper chainsets that have a for chainrings with 48 teeth. Known compatibility:Shimano FC-M171 / FC-M311 but may fit others from around 2003 onwards.
Y1M298160 Shimano FC-M431 8-Speed Chain Guard 48t Chain Protection Ring w Bolts
Shimano SPARE PART FCM431-8 chain guard 48T
Shimano FC-M371 Chain Guard 48T 9 Speed Y1NK98090
Wjsdsg Mountain Bike Chain Wheel Bash Guard Bicycles Crank Chainring Protector Bike Chain Guard For 22T-26T Single Chainring