Description: Package: 1 pcs RM4020--600mm anti-backlashed ballscrew 1 pcs RM4020 ball nut The ballscrew is machine end per BF30/BK30 drawing. Note: 1.we have all diameters of RM/SFE/DFU series 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. 4.The coupling has the other diameter.If you need the other diameters, please feel free to contact us. Payment: 1.payment is default payment way. 2.All the payment must be made after purchase. 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.