I've been thinking about buying one of these but I don't know if they are just a gimmick. Also, if they genuinely work well how good do your bits need to be in the first place to be worth sharpening?

Dull drill bits are not usually a type of tool that's worth buying used, unless you can sharpen them yourself. Many companies that sharpen drill bits use precision grinding machines, but there are ...

How to sharpen drill bits with a homemade tool for angle grinder Catherine O'Hara's cause of death revealed They found a 2,000-year-old Roman tombstone in their backyard. Then the FBI showed up. NFL ...