The DVR108 from Losmandy are a pair of 4.25" (108mm) guide scope rings designed to attach a guide scope to your telescope kit.
The rings attach to Losmandy D-series and Vixen V-series plates via a tool-less dovetail clamp on the bottom of each ring. Once attached, the guide scope may be inserted into the rings and adjusted via three 7075 aluminum positioning screws which feature 1/4" Delrin tips. The I.D. range of these rings is from 2.96" to 4.32".
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Haven't used them yet due to cloudy skies but seems to be a very well engineered piece of astro kit that B & H delivered in lighting speed to Australia!
There's not too much you can say about something which is basically just a piece of metal. However, these Losmandy rings are very well made pieces of metal. The machining is very good as is the anodized finish. I would expect them to last many years. The mechanical parts fit and work well. I especially like the addition of nylon tips on the adjustment screws to prevent marring the instrument they would hold.