The die grinder cleans up areas that the angle grinder cannot reach. In this video, I explain all of the advantages that die grinders are used for, in the steel industry. At the end of the video, I explained bolt holes and slotted holes and how to clean them with a die grinder 

Enjoy!
Always remember: safety 1st. Use 2 hands because you’re dealing with 25,000 RPMs. I recommend leather gloves and safety glasses as well as a full face shield.
(trust me, you don’t want metal shavings in your eyes)

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