Impregnated diamond core bits can penetrate a broad range of formations from the softest to the hardest rocks.

Core Barrel Designation	Core Bit				Core Bit
	Outside Set Diameter				Inside Set Diameter
	Maximum		Minimum		Maximum		Minimum
	Inches	mm	Inches	mm	Inches	mm	Inches	mm
HQ	3.77	95.76	3.755	95.38	2.505	63.63	2.495	63.38

 They are manufactured with high quality synthetic diamonds mixed evenly through a tungsten carbide matrix. (During drilling the matrix wears away evenly resulting in continuous exposure of new, sharp diamond points throughout the life of the bit.)