Bike Chainring Sprockets Cranksets Guard Protector 46T 5 Bolts 65mm BK25 Size: 46T,5 bolts, 65*65mm Function: Prevents chain from jumping to the outside Color: Showed in the picture Weight: 20g approx. How many teeth of Cranksets? What size you can measure the diameter of the adjacent holes? Then you can choose which one you can buy .