Ideal for making countersunk holes for countersunk screw heads and plugs The counterbore is made of carbon steel and the surface is plated with titanium, which is sturdy and durable, not easy to rust, and has a long service life. service life. The kit is suitable for home DIY and daily use, and can be drilled easily and efficiently without burrs. Universal size is compatible with all types of drill bits and drill bits, including vertical drills and other common end mills. This set of 6 90 degree three-bladed drill bits is suitable for processing metal and some non-metallic materials, such as carbon steel, light iron, panel insulation, PVC boards, aluminum, hardwood, cork, etc. Handle: round handle Used for workpieces with a hardness of 25 or less, such as carbon steel , sheet metal, insulation board, PVC board and wood For workpiece holes with 90 chamfered or tapered holes, machining angle edges and corners and chamfered surface Only one taper treatment can be performed. Suitable for small cutting processing. Edges are sharp, smooth, no broken edges, low chamfer resistance, high precision in the hole, and more durable Large chip flute, fast chip removal The three blades range from medium to laborious, each blade is less stressed, more efficient and more durable Product size: The diameter of the handle is between 0.5cm and 1.2cm, and the length of the handle is between 3cm and 4cm. Shipping quantity: 1 set, including 6 pieces