STANDARD PRECISION: Bike crank arm help ensure ultimate chain retention, increase service life, and reduces friction and noise. There is no overlap between crank arm and chain ring bolt.170MM CRANK ARM: 170mm crank arm length without any overlap of crank arm and chain ring bolt. Fine polish and great paint, colorfast and stylish.HIGH AXIAL STRENGTH AND COMPATIBILITY: Bike crank arm is made of aluminum alloy, light weight, stylish, flashy styling, high axial strength and compatibility.WIDE APPLICATION: This left hand crank arm is suitable for road bike, mountain bike, folding bike, fixed gear bicycle, etc.Fit for: Left sideMaterial: aluminumSpecification: crank hole distance 170MMColor: BlackPackage includes: 1pc*crank teeth accessories