1、Made of high quality materials, this product is sturdy and durable. 2、High strength, high hardness, not easy to deform. 3、Sample design, fine workmanship, used for bike mid drive motor installation. 4、Lightweight and small size, easy to install and use. 5、Suitable for BMX Bike, BMX Bike ‑ Old School, Cruiser, Cyclocross Bike, electric bicycles, folding bicycles, hybrid / comfortable bicycles, mountain bicycles. Features: 1. Made of high quality materials, this product is sturdy and durable. 2. High strength, high hardness, not easy to deform. 3. Sample design, fine workmanship, used for bike mid drive motor installation. 4. Lightweight and small size, easy to install and use. 5. Suitable for BMX Bike, BMX Bike - Old School, Cruiser, Cyclocross Bike, electric bicycles, folding bicycles, hybrid / comfortable bicycles, mountain bicycles. Specification: Condition: Brand New Item Type: Crank Arms Material: Blend Material Color: Black Size: Approx. 21 * 3.8cm / 8.3 * 1.5inch Hole Center Distance: 170MM Weight: Approx. 450g Package List: 2 * Crank Arms Note:The product is a special crank for Tongsheng mid-mounted motor.1. Ensure that the appearance of the product is consistent with our products before purchase. 2. Measure the consistency of product size with our size. 2 * Crank Arms