Some bits come to a point and so are Therefore self-commencing. The much larger-size bits have blunt tips and they are used for gap enlarging. A countersink is a conical gap cut into a manufactured object; a countersink little bit (from time to time named only countersink) is the cutter https://lanemkeys.blogspothub.com/33392625/indicators-on-drill-bit-you-should-know