?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 used optimally for different applications. ?Function?burrs are broken and removed without scratching. ?Application? The 6-piece 90° cutting cutter set is suitable for machining on metallic and non-metallic materials, e.g. Carbon steel, steel sheet, iron, aluminum, PVC, wood plate, plastic, etc. ?High quality material? Made of HSS 4241. The titanium coated cutter is very sharp and features high concentricity and durability. ?Machine? Universally sized drill heads are compatible with common cordless screwdrivers and drills, including drill presses. Specification: Technical features: three-edged. Angle: 90 degrees. Material: HSS 4241 Quantity: 6 pieces Material: high speed steel 4241 (for hardness 25HRC 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