Bihui Tools Turbo Dry Core Bits

Professional quality diamond core bits designed for easily boring the porcelain, marble and granite tile.  May be used dry or wet. Vacuum brazed diamond bit M14 or 5/8"-11 thread to angle grinder High speed and long life (11,000 suggested RPM) Suitable for drilling porcelain, marble and granite 6 piece kit includes sizes 1/4", 5/16", 3/4", 1-3/8", 2", 2-3/4"