This sale is for
ONLY 1 of the 3 extension tubes shown in photos. If you wish to buy all 3, make an offer, the shipping cost will be the same.
All 3 extension tubes have slightly different markings, an only the PK-3 has the external coupling. I will revise the page if less than 3 are available.
PLEASE SPECIFY WHICH ONE OF THE THREE TUBES YOU WISH TO PURCHASE.