Feature:1. Electroplating Appearance: The cycling crank screw has a colorful electroplating appearance, which is anti oxidation, no rust, with engraved pattern, not easy to fade. Easy to install2. CNC Process: The bike crank screw adopts CNC cutting process to ensure strength and hardness, and can be used with confidence3. Accurate Thread: The thread of the bike crank cover screw is processed by automatic thread rolling machine for fine and accurate pitch and good sealing4. Aluminum Alloy: The crank screw is made of aluminum alloy, which is not easy to be damaged, has high hardness and is not easy to deform5. Scope of Application: The for M20 crank screw is suitable for for M4000, for M590, for SLX, for XT and other hollow one piece cranksetsSpecification:Item Type: Crank ScrewMaterial: Aluminum AlloyApplicable To: For M4000, for M590, for SLX, for XT and Other Hollow One Piece Cranksets.Package List:1 x Crank Screw2 x Screws