Description: The shaft is case hardened. If you use normal steel shafts, the bearings will cut them up in no time. So make sure what you buy is case hardened! Aluminum support rail with pre-drilled holes for ease of mounting Perfect for your DIY CNC routers, mills, lathes Suits X, Y, Z axis No more unwanted errors in your machining work! All items located in China , so you will get it fast and packed well! Don't risk having it shipped from overseas! Brand new! Please check out my other CNC items we do provide combined shipping! Size: 20mm Package: 4 pcs SBR20UU Linear rail block carriage Note: 1.we have all diameters of SBR series Linear raila and RM ballscrew. If you need any , please contact us for information. 2.The length can be customised. If you need the other length , please feel free to contact us. 3.the ballscrew is standard machine end.It can be machine ended per-drawing. ? Payment 1. Payment service is the main collection method. Customers can pay through various channels. 2. Make sure that the order is accurate before payment. If you change your plan after payment, find the transaction in the purchase record and select " Request Cancel Transaction" from the options. Because of's update policy, sellers' cancellation transactions are recorded in the list of non-performing transactions, and only buyers send cancellation requests will not be recorded in non-performing transactions. International freight ? 1. All orders are shipped from China. 2. All orders are transported by appropriate and reasonable freight mode, and the freight time is generally about 5-14 days. Typically international commercial delivery -- TNT, UPS, FedEx, DHL, E-packet, and speedPak logistics. 3. Because there are regional differences in international freight transportation, some countries or regions are listed in our non-shipment list. But we can actually send it anywhere in the world. Buyers on the list only need to contact us to get postage and freight information in your area. 4.All the shipments will be traceable with the tracking number. FedEx ?https://www.fedex.com/en-hk/home.html DHL ? UPS ? TNT ? ? ? Processing time 1. Usually, we will deliver the goods within 1-7 working days after receiving the order. Because ballscrew processing takes time, we will not set inventory of ballscrew and guide rail in theory, because most guests will ask to change the size, so most of them are produced, assembled and packaged now, Reducing secondary damage caused by placement or repackaging of goods. 2. We set a 10-day processing date to reduce freight restrictions from the platform. 3. usually shows a long delivery time, and most of our goods will be delivered about 5-9 days after our delivery. Our total time is about 6-16 days. Per-sales consultation ? Our company has a professional team to reply to your consultation. Welcome to consult, welcome to customize your own CNC. After-sales and feedback Our company attaches great importance to after-sales problems. If there are any questions, we also have a professional team to answer them for you. If you are satisfied with our products and services, your positive comments are the greatest encouragement and support for us. International cooperation 1. If you are a factory or manufacturer and need stable supply, you can contact us. We support bulk procurement and shipping to reduce international costs. 2. If you are a local CNC parts seller, we can also provide you with sources of goods. We support mixed batches, but your purchase volume needs to reach a quantity. Only in this way can we minimize the cost and maximize your profits.