Core bits are purposed for core recovery in low-abrasive soft rock formations of l-lll category of hardness

	Modifications: are reinforced with large PDC cutters. They have rapid core recovery rate. Distinctive feature: better core removal due to smooth rock cutting with PDC cutters. Flushing holes are carried outside core catchers in order to prevent core damage with drilling fluid.
	Dimension acc. to new nomenclature Outside diameter, mm Core diameter, mm Code IADC Coupling thread Dimension acc. to old nomenclature 212/100 B413 212,7 100 S233 МК-180; З-161 BIT-212/100 M4 212,7/100 B413 212,7 100 S233 МК-180; З-161 BIT-212,7/100 M4 214,3/100 B413 214,3 100 S233 МК-180; З-161 BIT-214,3/100 M4 215,9/100 B413 215,9 100 S233 МК-180; З-161 BIT-215,9/100 M4

• 212,7/100 B413