Description: *HIGH QUALITY MATERIAL: The crank s are made of high quality materials, this product is sturdy and .High strength, high hardness, not easy to deform. *PERFECT DESIGN:The crank s adopt sample design,suitable for BM X Bike - Old School, Cruiser, Cyclocross Bike, electric bicycles, folding bicycles, for Hybrid / comfortable bicycles, mountain bicycles. .Total length and width is approximately 21 * 3.8cm / 6.3 * 5.9inch.Weight is approximately 450g. *EASY TO INSTALL:The crank is lightweight and small size, easy to install and use. *U will receive right and leftcrank ,a pair crank . Specification: Total length and width ： approx 21 * 3.8cm / 6.3 * 5.9inch. Weight ：approx 450g（L+R） Hole shape: Diamond Hole Crank length:170MM Applicable to BM X Bike - Old School, Cruiser, Cyclocross Bike, electric bicycles, folding bicycles,MTB bikes，36V/48V BBS01/BBS02/BBS03 series Bafang high-speed brushless toothed central motor modified bicycle motor, supporting specific motor model is BBS01 36V 250W/350W, 48V 350W, BBS02 36V 500W, 48V 500W/750W, BBSHD 48V 750W/1000W. Package Includes: 2PCS crank(left+right) note： Please check if the orientation of your right crank is square or diamond keep both left and right s having the same hole Our products are made from very reliable, high-quality materials ,sure to meet the needs of your daily life. Before placing an order, we suggest that you always check the size and model of the product carefully to ensure that the selected product meets your actual needs. If you encounter any problems, please contact us in time, we will try our best to provide you with solutions until the problem is solved satisfactorily. After you receive the product, we attach great importance to your feedback, no matter how your comments, we will listen carefully. Every customer can enjoy the free after-sales service we provide, and any damaged or quality problem products can be refunded or exchanged.