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