Bnineteenteam Bicycle Crank Arms, Horizontal Sq\., Black, Durable Sq\. Hole For Product Features WIDE USE:Available in 2 Spindle Interface Mode?¡§ooDiamond Interface and Square Interface.Please check if the orientation of your right crank arm is square or diamond keep both left and right arms having the same hole.The bike crank arms are suitable for BMX Bike, BMX Bike - Old School, Cruiser, Cyclocross Bike, electric bicycles, folding bicycles, hybrid / comfortable bicycles, mountain bicycles. FINE DESIGN:The crank arms adopt sample design, fine workmanship, used for bike mid drive motor installation.Size is approximately 21 * 3.8cm / 6.3 * 5.9inch.Weight is approximately 450g. NOTE: The product is a special crank for Tongsheng mid-mounted motor. Please confirm whether it fits your size before purchasing, otherwise it may not fit. EASY TO INSTALL:Package List:2 * Crank Arms.The crank arm is lightweight and small size, easy to install and use. ASSURANCE: If you are not satisfied with our product you received, you can send emails to us at any time.We will reply you instantly and help you solve your problem.After-sales service 100% guarantee, if our products have quality problems after receiving the goods, you can choose free return or full refund. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!