Joan Bicycle Chainring Sprockets Cranksets Guard Protector 42t 4 Bolts 105mm, Bike Chainstay Protector Size:42 Crankset Teeth 4 bolts 105mm4.13 inch) ,adjacent hole distance 105mm (4.13 inch ), as picture Note : 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 +4 bolts