Q: can this bit be used to drill rock I have been polishing different rocks and my grand daughter want to make jewelry what size bit should use?
Q: I'm looking for the first time at drill bits. High speed, spiral, not diamond coated. Some of the sites I'm looking at give numbers, such as yours. Please, in your product title, in addition to the number, which doesn't help me at all and means nothing, could you also give the width in mm (and inches might be helpful for some folks, too)? I've looked in your descriptions and it's hard to tell what size hole it will drill. I am looking for individual drill bits that will drill holes from 1mm to 3mm. Thank you!
Q: Are these drill bit using to drill metal sheet like copper or nickel silver?