1.Aluminum alloy construction :durable and strong
2.The center distance between two holes is 170mm.
3.Spindle Interface Type:Square Taper. Please check if the orientation of your right crank arm is square or diamond. Keep both left and right arms having the same hole.
4.The Right is the drive side and the Left is the non-drive side
5.The left side pedal is reverse threaded so you tighten it backwards (counterclockwise).Drive side is normal, clockwise to install it.