Polycrystalline Diamond Composite is manufactured using top quality synthetic diamond grit, sintered together by way of extremely high temperature and pressure to create a polycrystalline diamond (PCD) layer. PDC is designed for oil-well bits and mining bits, which are suitable for use in soft to medium hard rock formations. PDC Rock Cutter for Oil Well Drilling Bits contact: shonali msn: old-stone(at)live.cn mail: 3usuperhard@gmail.com Phone: 8615837162551