What I like about these Adam Hall SM707 Speaker Flange is that they allow your speakers to be raised to full height and angled down into the audience for maximum coverage.
The need a bit of woodwork skill to fit as the existing top has to be removed and the hole cut to size for a good fit. (If you are making your speakers from scratch I would recommend these as standard) If Once installed adjustment is very easy all you have to do place your speaker on your stand then lift your speaker slightly, adjust to the required angle and lower on to the inbuilt ratchet so that the weight of your speaker locks it into place.
These are a great enhancement to any speaker.