Pieces of steel in cylinder??

Shot blast cab.. you mount the heads or block between bars and close the door....steel shot removes all crud. Old school

Yeah. We had one at a shop where I worked. But it wasn't like that. I liked it. A lot. It was a rectangle box I guess about 8" wide by 12" long. The top was hinged with a lock and the inside was lined with hard rubber. It was mounted on an axle driven by an electric motor. It was great for shot peening rods and smaller parts. It worked really good.