This is the first diamond tipped ebony feet we made. Size is 1.8” DIA x 1.25”H, studded with a 1/10 carat phono point diamond in a steel pin. We first developed this in 1989 for our own use, Later we found out that diamond size and ebony wood volume can increase the performance of the mechanical grounding. Later we improve this design to S.D.R, U.D.R and G.D.R sizes
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