Drills come in standardized drill bit sizes. An extensive drill bit and faucet sizing chart lists metric and imperial sized drills alongside the needed screw faucet measurements. There's also specific specialised drill bits that will create holes by using a non-round cross-portion.[1] A countersink is often a conical hole Slash https://drillbit14826.laowaiblog.com/33275508/drill-bit-manufacturer-fundamentals-explained