Check the listing for details. 10mm RMS DIN Parfocal focus microscope objective ring adapter *LOT 3x*. Condition: New, Made in Spain. Listed at 14.95 USD. They are RMS female and RMS male at each end. New design compatible with the most demanding Zeiss holders. RMS / DIN Parfocality-focusing rings 10mm (Lot of 3 rings). Price is for three (3) adapters.