🚲🚲【HIGH QUALITY MATERIAL】✅✅ The bike crank arm is made of premium aluminium alloy, lightweight, high strength and deformation resistance, durable for long time use can withstand huge pedaling force and drive the movement of bicycle tires. 🚲🚲【170mm RHOMBIC HOLE】✅✅ The center distance between two holes is 170mm without any overlap of the crank arm and chainring bolt; Spindle interface type, diamond hole type, please make sure it matches your original crank port. 🚲🚲【BIKE LEFT CRANK】✅✅ A nice replacement for bike repair, compatible with many bike models. Suitable for the road bike, mountain bike, folding bike, exercise bike, fixed gear bicycle, etc. A great replacement of crank arm! Note that it is suitable for the left crank arm. 🚲🚲【EASY TO INSTALL】✅✅ Fine polish and great paint, colorfast and stylish. Standard precision cutting of hole, which ensures perfect fit to bike, the total length of this crank arm is approx. 20.5cm / 8.07in, easy to install and fit well. 🚲🚲【SATISFACTION GUARANTEE】✅✅ We promises every customer a 100% shopping satisfaction, feel free to reach us if you have any questions about your purchase. If you received our item damaged or other question, please contact us refund or replacement.