It is quality, durable, and does not let any dust escape. It is worth more than what you pay for.

Well, after intensive testing (home renovation), I can say that the attachment does what it promises, it sucks up dust very well. I used it with a 125mm angle grinder and a grinding disc for concrete. Some small percentage of dust escapes, especially with uneven pieces where the contact with the surrounding brush is not good. It definitely requires the appropriate vacuum cleaner (not a household one) because the job won't be done as you would like. The yellow part opens so you can reach close to the wall (of course, there is enough dust escape). I simply solved this by wetting the area I would be grinding a little bit. The only problem I encountered was that the yellow part that opens to do the edges becomes difficult to move with very small pebbles. A little bit of tape on the inside of the joints solved the problem after I managed to remove it first. I am satisfied and would recommend it.