Check the listing for details. 1 pc SBR30 Linear Rail Retaining ring Limit Locking Ring Positioning Thrust Ring. Condition: New. Listed at 20.66 USD. Description Inner diameter: 30mmOut diameter: 50mmThickness: 15mmMaterial: aluminum alloy Package: 1 pcs SBR30 Position-Limit Ring Of Guiding Payment: 1.ebay 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:It will be sent out by E-packet.If you take with linear rails, it will be sent by with them by DHL ,TNT or FedEx. 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 Purchase1.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 on ebay is to avoid problem from ebay. 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.