【Sizes】 Blade diameter: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm. Shank diameter: 5mm, 6mm, 6mm, 8mm, 10mm, 10mm The different sizes can be optimally used for different applications. 【Function】 burrs are broken and removed without scratching. 【Application】 The set of 6 cutters with 90 ° of cut is suitable for machining on metallic and non-metallic materials, eg. Carbon steel, sheet steel, iron, aluminum, PVC, wood plate, plastic, etc. 【High quality material】 Composed of HSS 4241. The titanium coated end mill is very sharp and features high concentricity and durability. 【Machine】 Universal size drill heads are compatible with common cordless screwdrivers and drills including drill presses. Specification: Technical characteristics: three-edged. Angle: 90 degrees. Material: HSS 4241 Quantity: 6 pieces Material: high speed steel 4241 (for 25HRC hardness the following parts, such as carbon steel, thin iron plate, insulation board, PVC board, wood, etc.) Size: 6.3mm: 6.3mm * 5mm * 37mm 8.3mm: 8.3mm * 6mm * 40mm 10.4mm: 10.4mm * 6mm * 39mm 12.4mm: 12.4mm * 8mm * 46mm 16.5mm: 16.5mm * 10mm * 47mm 20.5 mm: 20.5 mm * 10 mm * 47 mm Application: This cutting countersink drill is suitable for machining on metallic and non-metallic materials, eg. Iron sheet, aluminum and wood plate, PVC, etc. Advantages: One-piece design: chips made in the process can be chamfered more easily, the housing, tool ergonomics do not obstruct delays. The knife can grind: a convenient means of protection is not necessary, the mass of uninstallation of the tool can be. In just one step: the automatic chamfering of the through holes allows the chamfered edges to be drilled quickly in a few seconds; Excellent. Material: All kinds of processing can be flexible or black metal, improve the blade, so that the service life is twice as long.