LAIWEI Bi-Metallic Hole Saw Kit 7PCS Hole Saw Set Contains: 7/8″(22mm Hole Saw), 1”(25mm Hole Saw), 1-1/8″(28mm Hole Saw), 1-3/8″(35mm Hole Saw), 1 -3/4″(44mm Hole Saw), 2″(51mm Hole Saw), 2-1/2″(64mm Hole Saw) NOTE: For your safety, please wear goggles and gloves when using Hole Cutter. These hole saws are perfect for jobs that require high performance and precision. Ideal for cutting wood, plastic, machinable metal, studded wood, plywood, pipe and steel. High-speed steel cutting edges provide impact-resistant teeth and prevent tooth spalling. Soft spring steel forms a flexible backing material that allows the hole saw to absorb the shock of drilling holes in difficult-to-cut materials. Versatile cutter for a variety of applications; suitable for plumbing, construction, aircraft, electrical other, maintenance and automotive applications. Thanks to its variable pitch, it cuts faster, smoother, and without as much vibration as other products; creates holes for pipe and pipe installations, door lock installations, wire conduits, hoses, and antennas. 7x24 customer service.