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 ...

A workman is only as good as his tools. At least that's how the saying goes. When it comes to such workmanship, nothing kills a workflow like a dull drill bit. They are cornerstones of any good garage ...