Set of 8 near flat bottom order Rust

order Set of 8. 4 inch round Gorgeous and stable iron rust patina beautiful color variations rust browns. Awesome heavy steel sculpture base Measures 4 inches in diameter stands 2.5 inches tall with a 7/8 inside dimension bore. bottom is flat and or slightly concave weighs 3.5 lbs. dimensions and weights vary slightly. Perfect table lamp stand. There are many available with this sweet industrial salvage patina.
Note: This is a general description for a set of eight similar as described. need something smaller or larger several are available from 3 to 11 inches some larger some smaller with varying contours. custom machining also available contact me for viewing and quote.
Back story note: I found these at a industrial salvage auction. Immediately I recognized the potential use and had to have them but didn't know what the original use was. as it turns out they are called lens lapping plates. used to shape and polish lenses for telescopes. Kind of cool.