The shroud has a removable edge piece for surface work flush to edges or other objects. It also has soft brushes that help contain the dust and allow for smooth movement over the work surface. The outside diameter of the extraction port will work with most standard vacuum hose systems. Angle grinder dust cover guard with brushes for easy Height adjustment as tool grinds, easy to replace brushes, no need to change shroud only change the brushes. angle grinder attachments.