Worth the whole day. Not only will you be able to cut/drill faster, but you'll also significantly extend the life of your tool. For the price of a $10 can, you can save a fortune on drill bits, not to mention a ton of time. And that little jar makes a big difference. Get it and use it. If you're not familiar, using it simply means adding a few drops between your material and the instrument. For example, if you're drilling steel on a workbench or press, simply squeeze a few drops directly ontoβ¦