Features: brand new and high quality High Quality Material: Made of aluminum alloy, light weight, stylish, flashy styling, high Axial strength and compatibility. Fine polish and great paint, colorfast and stylish. Standard Precision: Ensure ultimate chain retention, Increase service life, and reduces friction and noise; There is no overlap between crank arm and chain ring bolt. Perfect Cutting: Standard precision cutting of hole, which ensures perfect fit to bike, 170mm bike crank arm length without any overlap of crank arm and chain ring bolt. Spindle Interface Type: Horizontal Square Taper. Please check if the orientation of your right crank arm is square or diamond. Keep both left and right arms have the same hole. Widely Application: The crank arm suitable for road bike, mountain bike, folding bike, fixed gear bicycle, etc. A nice replacement for bike repair, for many bike models. Specifications: Material: Aluminum Alloy Color: Black Package Weight: approx.450g Length Between Holes: approx.17cm/6.7in Total Length: approx.21cm/8.3in Package Includes: 1 Pair of Bike Crank note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!