“These chainring bolts are made of steel material, high hardness, strong wear resistance. The crank bolt is easy to install. With non-skid design. You can install the new bolts without any problem. The grooved non-slip base and fine threads of these bolts provide balanced strength. The crank bolts are extremely light, very easy to transport and take up a little space. These bicycle doodle bolts can be used to repair single/double chain flywheel of mountain/MTB/road/BMX bike, etc. Delivery quantity: 4pcs Product color: mixed color Product size: 12*9mm