Size: step height * total height * inner diameter * outer diameterWorking pressure: ≤ 1.0MpaWorking temperature: -35 to 80 degrees CelsiusReciprocating speed: ≤ 1 m/sMedium: Oily lubricating air and dry and oil-free airPackage：2pcs Shipping Description： Item will be shipped by airmail with tracking number (ship to USA by USPS epacket delivery ) within 24 hours(1 working day) after full payment is received. A notification email of dispatch will be sent to buyer after item is posted. Please email us if you don't receive our email after 3 days of full payment sent. Return Description： In the unlikely event that a return is request, all returns must include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms, etc. Shipping and handling fees are not refundable. Buyer is responsible for shipping costs incurred shipping products back.