Package Includes: There is one pack of left-arm crankset included and the orientation of this left crank arm is a rhombic Hole (slanted hole). Please check the description of the product carefully so that the crank arm is suitable for your bikeAbout Size: 170mm crank arm length without any overlap of the crank arm and chainring bolt. This bike crank arm can help ensure ultimate chain retention, increase service life, and reduces friction and noiseHigh Quality: Made of premium aluminium alloy, light weight, stylish, flas styling, high axial strength and compatibility, durable for long time useEasy to Install: Standard precision cutting of hole, which ensures a perfect fit to bike, easy to install and a fine polish and great paint, colorfast and stylishMultiple Function: The crank arms are plastic coated to increase anti-scratch protection and to allow a solid texturized matt black finish. This left-hand crank arm is suitable for the road bike, mountain bike, folding bike, fixed gear bicycle, etcColorBlack