Features： 1、Ultra Light Material: The crank is made of high strength aluminum alloy, which is durable and wear resistant under stress and will not break when stepped on. 2、Ergonomic Structure: These bike accessories have stable structure, good compression resistance, and are sturdy and durable. for people who want more control on their bikes. 3、Accurate Processing: CNC machining is adopted to ensure the ultimate retention of the chain, prolong the working life, and reduce friction and noise. 4、Lightweight While Strength: The left and right cranks are hollowed out in a large area, greatly reducing the weight while maintaining the strength. 5、Wide Compatibility: Our bike crank arm set is compatible with single disc, double disc, three disc, and it fits for most mountain bikes and road bikes on the market. Specification： Item Type: Crank Arm Set Material: Aluminum alloy Weight: Approx. 950g/33.51oz Crank Arm Length: 170mm/6.69in Compatible: 9-12 speed Style: 32T Package List： 2 x Crank Assembly Parts 1 x Chainring 1 x Bottom Bracket 2 x Tool 4 x Steel Nail Assembly 4 x Steel Nail Accessory