Features: 1. Made of premium aluminium alloy, hollow design, which is lightweight, adding no heaviness to bike. 2. High strength and deformation resistance, for long time use. 3. Standard accuracy machining, which ensures chain retention, increases service life, and reduces friction and noise. 4. 170mm crank arm length without any overlap of crank arm and chain ring bolt.5. A good replacement for bike repair, compatible with many bike .Specification:Material: Aluminium Alloy Color Options: Black; SilverBCD: 130 mm (suitable for 107-110mm)Arm Length: 170 mm/ 6.7 inch Fit for: pedal diameter = 9/16 The distance from the center of the plate nail to the center axis: Approx. 65mm / 2.6inApplicable bottom bracket: Approx. 107-110mm / 4.2-4.3inWeight: Approx. 555 gPackage List: 1 * Pair of Crank ArmsNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.