BESTOP Copper Ring Diamond Polishing Pad. Outer ring is copper bond, and centre area is resin bond.  We also can make all copper bond or all resin bond type. This product are very aggressive and long life. They are also less likely to break off on the edges since they have wider edges.

Diameter: 4", 5" (100mm, 125mm);
Thickness: 3mm working thickness;
Grit: 50#, 100#, 200#, 400#, 800#, 1500#, 3000#;
Usage: Wet and Dry Used;
Application: Granite, Marble etc.

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