stainless steel duct for sale, brand-new and used.

4 1/2 " HSS Bi-Metal Bimetal Hole Saws, 5/8-18 Metal Wood HVAC Sewer Pipe Vent Duct New Barnes Distribution 4-1/2" High Speed Steel, Bi-Metal Hole Saws, Part Number BD3168 These are just the thing for cutting holes in HVAC trunks, or for running sewer pipes and vents. Uses any 5/8-18 threaded or pinned style holesaw mandrel (not included). They have a varitooth design (teeth are spaced irregularly), which helps prevent the saw from establishing a grabbing "rhythm" during use.