MTB Mountain Bike Left Side Crank Arm 170mm Square Rhombus Hole Crankset Road Bicycle Left Crank Cycling Repair Accessories Features: brand new and high quality. Made of premium aluminium alloy, lightweight, high strength and deformation resistance, durable for long time use. Standard precision cutting of hole, which ensures perfect fit to bike, easy to install. Only one crank arm for left side, 170mm crank arm length without any overlap of crank arm and chain ring bolt. A nice replacement for bike repair, for many bike models. Specification: Name: Bike Crank Arm Color: black, silver Material: aluminium alloy Length: 170mm/6.69" Types: Rhombus(45), Square(0) Weight: about 207g/7.3oz Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm 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! Package Includes: 1 Bike Crank Arm