Electric, Folding, Hybrid, Mountain, And Road Bikes All Use The 170Mm Bike Crank Specification: Material: Aluminium Alloy Options: Black-Square Hole; Black-Rhombic Hole; Silver-Square Hole; Silver-Rhombic Hole Total Length:Approx. 20.5cm / 8.07in Hole Distance: 170mm Fit for: Left side Weight: Approx. 200-214g Package Included: 1 x Crank Arm ?High Quality? Made of premium aluminium alloy, light weight, stylish, flashy styling, high axial strength and compatibility, durable for long time use ?Exquisite Workmanship? This bike crank arm adopts excellent manufacturing process with fine polish and great paint, which has stable performance and stylish appearance and can add a unique look to your bicycle. ?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. ?EASY TO INSTALL?The crank arm is lightweight and small size, easy to install and use. ?WIDE APPLICATION?This left hand crank arm is suitable for road bike, mountain bike, folding bike, fixed gear bicycle, etc.