The steel brushes are worth it alone. I use them to clean out carbon on egr ports on a cummins diesel engine all the time. They're also really handy to clean the silicon out of bolt holes on timing covers, oil pans or whatever. The brass is a bit too soft to do the heavy lifting so they're my backups for when I decided to order another set. But overall, worth it.Update: these steel brushes are really hard on aluminum. They’re great for anything else really but be cautious of your base metal.
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