Features: Condition: 100% brand new and high quality. Material: Plastic The color black Diagonal pitch: approx. 15.5cm/6.1inch Adjacent location: approx. 11cm/4.3inch Suitable for Shimano M430, M590, M390 Suitable for 44T chain wheel (hole distance must be adapted) Weight: approx. 37g Packing list: 1 x Crank Ring Protector 4 screws 4 x nuts 4 seals Note: 1. Please make sure your crank sizes are applicable to this cover and make sure 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 only suitable for Shimanos M430 and M590 and M390 skid plates, suitable for chain discs with a maximum of 44 teeth. When installing, it should be noted that when some chainrings leave the factory, there is no thread in the mounting hole, so you need to tap it yourself.4. Note that some 590 cranks do not have four screw holes. This product cannot be installed with this type of pedal board. Please confirm carefully before ordering.