This diamond crown ring is used to recondition worn core drill bits. As a single, continuous piece, it's brazed onto the core barrel, which simplifies the retipping process and ensures perfect segment spacing and concentricity. This results in a more stable cutting head that runs with less vibration. Made with high-quality diamonds in a durable bond for fast cutting and a long life in concrete, using a crown ring is a cost-effective and environmentally friendly way to restore a core bit's performance.