For sale; Pair of Parallax clamp rings for a 7" OD tube. These are in excellent condition. I used these on a Losmandy G-11 mount and have a Losmandy dovetail plate (17.25" long)to which they can be attached. The dovetail plate was sent to Parallax for drilling. The current price from Parallax for these rings is $149 and the dovetail plate retails for about $55. I'll sell all three for $150 plus shipping.