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! ?These rails are also available in diameters. ?Brand new! ?Please check out my other CNC items we do provide combined shipping! Id: 50mm The linear rail is case hardened.It is per-drilled. The order is as follow 2 pcs SBR50--800mm linear rail 4 pcs SBR50UU Note; We have the other diameters of linear rails.All the length can be customised. Payment: 1.Paypal payment is default payment way. 2.All the payment must be made within 7 days. Shipping 1.All our items will be sent out via fast way--FeDex,DHL,UPS ,TNT and some other fast way. 2.Normally , we would send to any place.But some loctions may be vary on shipping. We set them into excluding locations.If you are in the list, please contact us for information. 3.Shipping date: DHL is arounding 3 -- 12 days. FeDex,UPS,TNT is arounding 7-- 14 days. 4.For some length and weight, DHL may be cheaper.But it is not always.We will choose proper carrier. Duty: We firmly believe there will be duty to the orders. Buyers must pay this fee. But we will do our best to help buyers to low the fee as possible.We would mark the reasonable declared price on the shipping invoice. It do work to most of buyers. Before After Purchase 1.If you have any question before or after purchase, please feel free to contact us. We will reply them as soon as possible. 2.If there is any problem on order, please contact us at once. We will solve them at fastest and friendly ways. Handling Time: Normally, we would send out all the orders in 3--5 days.We set 10 days is to avoid problem from. Packing: We have do a lot of work on packing. We would use hardborad and pearl wool to pack them.It can protect item from bending during shipping.