SUPER MATERIAL FLINTRONIC HSS high-speed steel hole saw made of high-speed steel, which has high hardness and wear resistance. After high-density grinding and high-end heat treatment, it features high strength and precision to perform cutting smoothly.SET OF 5 HOLE SAW 16mm/0.6in, 18.5mm/0. 7inch, 20mm/0.8inch, 25mm/1inch, 30mm/1.2inch; Length: 65mm/2.55inch, Diameter: 9mm/0.35inch; 5 pieces Hole cutters are individually packed in a plastic box, all come with their own Allen key to remove the pilot bit and the bit also unscrews from the shank.HIGH EFFICIENCY: Cutting fast, with sharp blades and high hardness, in just a few minutes, the HSS hole saw kit cuts holes precisely in steel, stainless steel, iron, copper, brass laminates , aluminum, fiberglass, formica, etc.INTELLIGENT DESIGN The hole cutters use spring loaded design which is perfect for chip removal, drilling efficiency is higher.The important thing is that the handle adopts hexagonal design, which makes the drill more stable, could totally avoid the sliding problem when we use it.WIDE APPLICATION Hole saws are designed for thinner steel drill bits. They can be perfectly installed on locks, knobs on doors and cabinets or larger diameter holes. It is also suitable for bench drills, electromagnetic drills, pistol drills and impact drills. It is also suitable for stainless steel plates, square tubes, iron, cast iron, wood etc. Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.