Specification: Material: alloyOuter diameter size: 16mm, 18mm, 20 mm, 22 mm, 25 mm, 26 mm, 28 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 53 mmChuck size: 10 mmApplication: Can be used for bench drills and electric drill chucks with machine tools Product Description [High quality material] The gears are made of YG8 tungsten carbide steel, and the rigidity varies from the hole saw has a twist drill inside, sharp edge, high strength, high precision , smooth cut, especially impact resistance and resistance mill.[Intelligent design] 64HRC to 65HRC. Three groups of edges, each blade in the cutting process is responsible for 1/3 of. Sharp gears and low consumption anti-cutting edges make the product have a long service life.[13 different sizes] Outer diameter size: 16mm, 18mm, 20mm, 22mm, 25 mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 53mm[Decorative Hole Drilling] Carbide teeth for fast clean round hole cutting. Suitable for hand-held electric drills, motorized drills and mobile ribbon type magnetism drills.[Use for] fast and accurate hole cuts in stainless steel, stainless steel ;mild steel, iron, copper and brass. Can drill approximately 20mm deep for wood and drill approximately 5mm for stainless steel. workload and inside each edge also has a sharp edge, also because of the edge.Note: This product is not easy to cut relatively thin metal material, can cut within 2-5mmStainless steel plate and metal plate 15mm Features of the boring saw set: Each edge is part of the features of the cutting work, so the hole is not easy to make the appearance of a collapse.Drilling stainless steel plates, steel, castings, aluminum alloys, iron and other metal plates, chip evacuation, excellent performance , sharp edge, wear-resistant. Hole saw drill bit description: Three groups of edges, each blade in the cutting process is responsible for 1/3 of the workload, and inside each edge also has a cutting edge, also because of the edge, each one the load on the properties of the edge. #39;part of the cutting work, do hole drilling is not easy, to create the appearance of edge break. luckymeet