Feature:1. 3 Flute Blades: Mainly made of YW2 cemented carbide steel, the 3 flute annular cutter has high hardness, which will largely simplify the work.2. Smooth Cutting: Moreover, the spiral flute enables little cutting resistance and easy chip removal, ensuring no stuck during the processing.3. Extensive Uses: Allows for wide application on various materials, such as steel plates, cast iron, stainless steel, aluminum copper and more.4. Including 7Pcs: There are a connecting rod and 6pcs different mag drill bit of 13mm, 15mm, 17mm, 19mm, 21mm, 25mm, more than enough for needs.5. Easy to Install: Comes with a compact size and a light weight, all the annular cutters are very convenient to install within several minutes.Specification:Item Type: Annular CutterMaterial: Cemented Carbide SteelSpecification: Approx. 13mm / 0.51in, 15mm / 0.59in, 17mm / 0.67in, 19mm / 0.75in, 21mm / 0.83in, 25mm / 0.98in.Package List:1 x Connecting Rod6 x Annular Cutter1 x Plastic Box