Surface-Set Diamond Core Bit is set with a single layer of natural drill diamond on the working surfaces of the bit crown in a pre-determined pattern. Ideal Diamond Products Pvt. Ltd. Manufactures Surface-Set Diamond Core Bit. Ideal Diamond Products Pvt. Ltd. Also manufactures a wide range of diamond core bits of wide encompassing range for deep hole operation, mineral exploration, coal exploration, site investigation and civil engineering works. Surface-Set Diamond Core Bit is primarily recommended for use in drilling relatively soft, abrasive, unconsolidated formations that are not effectively drilled by impregnated diamond bits. They are also ideal for use in drilling harder formations where the available rotational speeds and bit loads are insufficient to use impregnated diamond bits due to drilling equipment limitations.