Drills are available in standardized drill bit dimensions. A comprehensive drill bit and faucet measurement chart lists metric and imperial sized drills along with the required screw faucet measurements. There's also certain specialised drill bits that could produce holes with a non-round cross-area.[1] A countersink is actually a conical hole https://drill-bit82604.blogacep.com/39563322/the-definitive-guide-to-drill-bit