4 stars because I am generous

First of these telescope mount is adjustable only between 750-1000mm. Correct product description is probably the least. However, it would be with a hammer and drilling 2 new holes possible a new adjustment range between 383-750mm set ... but then convert frankly better, here comes Pretty easily.

As an aspiring engineer, I can only say that this product is constructionally a disaster. Ease of installation was the designer obviously a foreign concept. Reassemble more experimental than for "manual", if one may call it that because this wiping. And until such time, be geballert on which all screws on the holder and the thing even slightly distorted, the holder wobbles like a cow's tail ...
Incidentally, it was not the two screw types suitable to attach a Acer projector. A somewhat larger screw selection would have been desirable because in any case.

So one has smooth the question why 4 stars. Well, if the bracket included Beamer someday hang from the ceiling, is actually all right. 4 stars also because it simply lack of other alternatives