Features: Application: It is used to fix the the crankset and crank of the chain wheel. Compatible Model: Crankset screws are designed for MTB and road bikes. Function: To replace the old or damaged screws of the m19 crankset. Material: Made of aluminum alloy material, durable and not easy to break. Easy Installation: No other tools needed, easy to install and remov-e. Specifications: Material: Aluminum Alloy Color: Black, Red, Blue, Green, Gold Size(Approx.): M19 Package Included: 1 * Crankset Screw