Ideal for milled holes for milled screw heads, as well as milled holes for cards Countersinks are carbon steel, the surface is covered with titanium, robust and durable, not Easy to rust, long life. This kit is suitable for home-free DIY and daily use, it allows to drill easily and efficiently, without burrs. Universal size compatible with all types of drill, drilling machines, including the vertical drilling machine, and another common strawberry. This set of 6 piercing strawberries 90 degrees 3 sharps suitable for work on The metal and certain non-metallic materials, such as coal steel, light iron, insulating panels, PVC panels, aluminum, hardwood and soft, etc., Features: Handle: Round handle Used in hardness under the room, such as carbon steel, sheet, insulation panels, PVC panel, wood For the room hole of the chamfer at 90 or the conical hole, the surface of the edges and chamfering angles of the treatment angle can be completed finished the cone processing for one time. Applicable to the small cutting process. Neat edges, smooth, no broken edge, small chamfering resistance, high precision in the hole, more durable Flute with big chip, Fast for the elimination of chips Three medium blades for laborious, each force of the smaller blade, high efficiency and more durable Use: Applicable to stainless steel, mold steel, iron, copper, serial treatment of aluminum, and carbon steel, thin plate of iron, insulation board, PVC board, advice Wooden, etc. Specifications: Material: HSS Surface treatment: Titanium coated Size: Head diameter * Diameter of the rod * Length 6.3 MM: 6.3mm * 5mm * 37mm 8.3mm: 8.3mm * 6mm * 40mm 10.4mm: 10.4mm * 6mm * 39mm 12.4mm: 12.4mm * 10mm * 46mm 16.5mm: 16.5mm * 10mm * 47mm 20.5mm: 20.5mm * 10mm * 47mm The package contains: 1x 6pc three chamfering drilling