Impregnated diamond core bit are made using very small, high quality synthetic diamond grits mixed evenly through a metal matrix and are reinforced with carbide and diamond. It is used for cutting medium to ultra-hard formations. The impregnated diamond bit is used for grounds ranging from broken and highly abrasive to fine-grained, consolidated and ultra-hard rock. The bit re-sharpens, exposing new diamonds as it drills, renewing the cutting edges. New diamond layers are exposed as the matrix wears away. Several waterway designs are available for different types of formations and conditions.