1、Standard Thread: The bike crank fixing screw has a standard thread, which fits snugly and prevents the entry of water, dust, etc 2、Burrs Free: The appearance of mountain bike crank screw is free of burrs, so you don't have to worry about scratching your hands during use 3、3 Color Options: The bike crank fixing screw has 3 different colors, which can be selected according to your preference and needs 4、Aluminium Alloy: The bike crank screw is made of 7075 aluminium alloy, which is lightweight and resistant to rust, wear and corrosion 5、M18 Thread: The aluminum alloy crank screw has M18 thread, which is suitable for hollow one piece chainrings, for FS.A chainrings and the old for FC 4500 and for FC 5600 road chainrings, etc Item Type: Bike Crank Screw Material: Aluminum Alloy 3 x Bike Crank Screw