Package includes 2 Pieces of M19 Crank Arm Fixing Bolt. Fit for 19mm Crank Screw. The crank bolt is made of aluminum alloy material, high strength, corrosion resistant, sturdy and durable. CNC machined with high precision for burr-free finish and standard threads, fits perfectly to keep water, dust and other elements out. Easy to install by using the British 3/8inch (10mm) allen wrench (not included). Crank fixing bolt is used to fix the crankset and crank of the chain wheel, suitable for mountain bikes and road bikes. Colour Red Size M19 Material Aluminum alloy Type Crank Arms screws Brand Unbranded/Generic MPN W2D94670842253 EAN 4894670842253 .