170mm Bike Aluminum Alloy Left Single Chain Crank Arm Replacement (Silver Square Hole) Features: Made of premium aluminium alloy, lightweight, high strength and deformation resistance, durable for long time use. Fine polish and great paint, colorfast and stylish. Standard precision cutting of hole, which ensures perfect fit to bike, easy to install. 170mm crank arm length without any overlap of crank arm and chain ring bolt. A nice replacement for bike repair, compatible with many bike models. Specification: Material: Aluminium Alloy Options: Black-Square Hole; Black-Rhombic Hole; Silver-Square Hole; Silver-Rhombic HoleTotal Length:Approx. 20.5cm / 8.07in Hole Distance: 170mm Fit for: Left side Weight: Approx. 200-214g Note: Pay attention to the shape of the inner hole of the crank. The hole in the middle of some cranks is diamond-shaped, and the hole in the middle of some cranks is square. Before purchasing, you need to confirm the inner shape of the original handle. Package Included:    1 x Crank Arm