The countersink drill bits with titanium coating in 6 different sizes are perfectly suitable for removing burrs of metal plate and chamfer of wood plate without leaving scratches. They also have a high circular machining accuracy and stability. and : The drill bits are and , suitable for processing all types of steel, wood and plastic plate. Precision chamfer: The countersink drill bits can help to drill holes accurately. Remove burrs perfectly: The countersink drill bits can remove burrs well without leaving scratches. The drill bits of standard sizes are compatible with all kinds of common drill and drilling machine, including vertical drilling machine. diameter of the countersink top: 20.5mm,16.5mm,12.4mm,10.4mm,8.3mm,6.3mm; diameter of the bottom: 10mm,10mm,8mm,6mm,6mm,5mm; length overall: 63mm,61mm,59mm,48mm,47mm,43mm; Material: High Speed Steel Shape: 3 flute Edge: 90 degrees type: A colour: silver Material: high-speed steel Package Contents: 6 x countersink drill bits Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.