Joan Bike Chainring Sprockets Cranksets Guard Protector 52t 5 Bolts 106mm, Bike Chainstay Protector Size:55T 5 bolts 106mm(4.17 inch) ,adjacent hole distance 106mm(4.17 inch ) as picture Before you order it, Please Count the teeth of your bicycle crankset ,Count the crankset holes , and measure the diameter of the adjacent holes .Any doubt , please feel free to contact us , Thanks Material:Engineering plastics Prevents chain from jumping to the outside Qty: 1 x Chain guard protector +5 bolts