Check the listing for details. Microscope Objective RMS Thread Extension Tube Spacer Adapter Parfocal Length. Condition: New. Listed at 7.30 USD. Microscope objective RMS thread Extension Tube Spacer adapter 15mm Product Feature: Female theread RMS (0.8 inch 1/36TPI) Male theread RMS (0.8 inch 1/36TPI) adapter (made of aluminum, anodized black) to use RMS thread (.8"X 36tpi) objectives, Increase an Objective's Parfocal Length by 15 mm per Extender. The inside of the adapter is fully threaded to minimize reflections this price only for one adapter,the lens just for demo,thankyou! Directed from factory,welcome wholesaler!! Payment: We accept paypal only!it is easy and safe! All payment must be made within 7 days after the auction ends. Very Appreciated. Shipping: The item will be shipped via international express as soon as the payment cleared and after the confirmed shipping address & phone number are provided. item will be shipped by epacket to United sates,United kingdom and Australia.it will take about 7-13 days. And pls note that other countries,item will be shipped by registered mail.It usually takes about 10-25 working days to delivered. Delivery tracking number will also be provided to buyers. For all orders, please note that: we ship the item to the address which list on the paypal,pls make sure the address on your paypal is correct. Because the package was shipped by registered mail,if the shipping is delay,pls contact us first, So we can resolve the problem for you. Return: We offer 14 days return policy. 100% satisfaction is our goal! If you have any problem when you receive the package please email us first asap. We will do our best to resolve problems for you . Feedback About the e-mail from our customers,we will reply within one day,but if you did not get reply within one day,pls give us more time. If you are satisfied with our items and service,pls do not forget left your positive feedback,very appreciated.