[olredalert]

----I have that Harbor Freight tumbler. I bought it to remove rust from tons of stuff that got rusty due to the fire and its aftermath in my old shop. The guy at H-F told me to use these little pyramids as media that they had in stock. They worked to some extent but never did the whole job as they were too big to get down in the threads and complete job. I ended up glass beading every bolt to get them truly clean. Another media might have done more......Bill S