Features:This crank ring protector is lightweight with simple and classic design.Provided with screws and gaskets, easy to install.Give your crank ring a good protection, and prevent your clothes get dirty at the same time.Suitable for Shimanos M430, M590, M390.Great acessory for your chain wheel.Specifications:Condition: 100% Brand New and High QualityMaterial: PlasticColor: BlackDiagonal Pitch: Approx. 15.5cm/6.1inchAdjacent Pitch: Approx. 11cm/4.3inchSuitable for Shimanos M430, M590, M390Suitable for 44T Chain Wheel (Hole distance must be matched)Weight: Approx. 37gPacking List:1 x Crank Ring Protector4 x Screws4 x Nuts4 x GasketsNote:1. Please make sure if the sizes of your crank set is applicable to this cover and make sure if your crank ring has 4 screw holes.2. The length of the screw is just right, no need to change, any change will affect the speed change.3. Please note that this product is onlysuitable for Shimanos M430 and M590 and M390 guard discs, suitable for chain discs with a maximum of 44 teeth. When installing, it should be noted that when some chain rings leave the factory, there is no thread in the mounting hole, so you need to tapping it yourself.4. It should be noted that some 590 cranksets do not have four screw holes. This product cannot be installed with this type of crankset. Please confirm carefully before ordering..