Kit comes with one grinder with a 7" dustless shround, two hoses, y-hose adapter and two dustless vacuums.  The reason two vacuums are sent with is because each vacuum is rated for 130 cubic feet per minute, a 7" grinding shroud requires approx. 175 cubic feet per minute, with the two vacuums you will have 260 cubic feet per minute.  Triple layer system captures 99.97% of particles at 0.5 microns. That is 0.00005 centimeters across, much smaller than the width of a human hair, a red blood cell, and the finest dust from concrete, drywall, fiberglass, and stone and masonry products.  Exhausts absolutely no dust back into the air  Clean filters without opening the unit.  Go between wet and dry without switching filters.  Filters and pre-filters won't be compromised by water or slurry.  Large capacity barrel easily holds 40 pounds of dust.  We sell the bags for the vacuum and we also sell 7" diamond cup discs for the grinder.