Specification: The diagonal distance is 14.5 cm. Material: Plastic. Mountain bike chain guard / bicycle guard / 4-hole chain guard. Distance between adjacent holes 9.75cmX10.6 cm. Outside diameter; 18.5cm. Name: Mountain bike crankset protective cover. Note: Transition: 1cm=10mm=0.39inch Please allow 1-3mm error due to manual measurement. Due to the different display and different light, the image cannot show the actual color of the item. Package list: 1pcbike crankset protective cover