I read the glowing reviews of this product with bafflement. The design is poor, with numerous large holes in part that connects to the vacuum cleaner that cannot be closed. As a result, there is almost no suction through the attachment and little dust can be picked up. There is a knob to turn that supposedly is intended to close the holes, but the holes are much bigger than the plastic covers, so this does nothing to improve suction. I will try to find, cut and fit a rubber gasket over the holes. As it stands, the product is useless.