Features:Made of fine metal.Easy to install and durable.It can extend or shorten the distance between wheels.Specifications:Material: Aluminum alloyThread diameter: 3mm / 0.12"Hexagonal wheel: 12mm / 0.47"Color: BlackHeight: 12mm / 0.47"Notes:Please allow 1-3mm differs due to manual measurement.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 4pcs xHub lengthening combineres Drop Shipping Service.1.There is no limited stock to fulfill the orders on a daily basis.2.For USA/CA /RU the shipping is quickly.3.Priority shipping,fast shipping in 48 hours.4.No invoice or receipt or promotional materials included. 1. WORLDWIDE SHIPPING. (Except some countries and APO/FPO) 2. Orders processed timely after the payment verification.3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.4. The images shown are not the actual item and are for your reference only.5. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit time may vary, particularly during the holiday season.6. If you have not received your order after 30 days from payment, please contact us. We will trace your order and get back to you asap. Our goal is customer satisfaction!7. Delivery Time: 1. You have 7 days to contact us and 30 days to return it from the date received. If the item is in your possession more than 7 days, it will be considered used and WE WILL NOT ISSUE A REFUND OR REPLACEMENT to you. There are NOEXCEPTIONS!Shipping cost is bear by both seller and buyer in half.2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your order ID.3. We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer