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This is the first diamond tipped ebony feet that SM made. Size is 1.8” DIA x 1.25”H, studded with a 1/10 carat phono point diamond in a steel pin.
They first developed this in 1989 for their own use but later found out that the diamond size and ebony wood volume increased the performance of the mechanical grounding.
So later they improved this design to S.D.R, U.D.R and G.D.R sizes.
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