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Specifications Material:Aluminum alloy Color:black;red,blue,silver,golden BCD:104mm Size1:Suitable for 32T~34T bike chainring,diameter 156mm Size2:Suitable for 36T~38T bike chainring,diameter 160mm Size3:Suitable for 40T~42T bike chainring,diameter 175mm Neighboring Hole Distance:74mm Weight:about 140g Package included: 1 X Bike chainring guard Features: 1.This chainring guard is durable and corrosion resistant,effectively prevents grease from the dirt chain,which offers a long time cycling. 2.Light weight and classic design,adding no heaviness to bike. 3.The ergonomic round design creates more stampede traction,which relieve the fatigue of leg or knee and ensures a smooth cycling. 4.Please make sure if the dimensions of your crank set is applicable to this cover and make sure if your crank ring has 4 screw holes. 5.Note: Please determine your crank BCD specification carefully before buying.