[Light and classic] -Diagonal hole is 15.5 cm and the adjacent hole is 11 cm. The exact design you a good experience. This crankshaft cover is simple and light with classic design. Suitable for 44T chain wheel .[ Note]-Please make sure that the size of your crank set is valid for this cover and make sure your crankshaft ring has 4 screw holes. The length of the screw is correct, no need to change, any change will affect the speed change. Please give a good protection to your crank ring and prevent your clothes from getting dirty at the same time .[ Chain chain chain protection, large akeesser for your chain wheel. Please make sure that the size of your crank set is valid for this cover and make sure that your crankshaft has 4 screw holes .[ Prevent dirt]- This bicycle chain protection can be sure that chain gras adheres to the trousers and improves the beautification function of the bike. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.